Had to use a safe picture because... reasons. 
Daddy/Daughter Time
Night Light slowly awakens from a nap on his bed he shared with his wife, Twilight Velvet, and stretches his body out, not minding the fact that he was naked and his flaccid cock hanging between his legs. “Hmmm, that was a much needed nap. So much time at work and I barely have time to relax by myself, besides being with my wife. I think a good shower will wake me me a bit.” He walks over to kiss his wife on the forehead and heads towards the bathroom, closing the door and begins to get hot water ready for him.
As he walks into the bathroom to shower, Velvet Sparkle wakes up as the shower turns on. "I guess you wanted a shower... I think I can go out and have the afternoon for myself." She says as she stretches her arms and pulls on her favorite dress and then pulls her mane back into a ponytail and then walks out of the room. “Going out for a stroll Twilight. Tell your father I’ll be back soon, okay? Love you!” Velvet calls out to her daughter, assuming she was in her room as she heads down the stairs to grab her keys and heads out of the house.
"See you mom," Twilight says with a smile and then watches her mother leave the house and then slips into their bedroom and sets the note down on his pillow so that he'd see it when he came out.
Moments later, the toned, older stallion comes out of the shower, refreshed. He looks towards his wife’s side of the bed and sees that she was gone, figuring she had gone out for a little while, which she does frequently, probably to the mall or for a walk in the park. He turns to his side of the bed and sees a note laying on it, surprised to see it. “Hmmm, did Velvet leave me this? She usually does this for our anniversary or for a special occasion. Is it one of those occasions?” he asks himself and lays on the bed and picks up the note and, to his surprise, finds out it was from his daughter, Twilight.
'Hi daddy! I just wanted to leave you this note to wish you a very happy day for you. I will say... even though this is hard to admit, even on paper, but I remember when I was exploring my body, that you and mom would bang in the middle of the night and I would lie awake and masturbate to the sounds of you two fucking like animals. I can't tell you how many times I came from listening to you fucking mom. I also have masturbated thinking about you fucking me also. I now want to feel what it'd be like to be with you.
Love your little girl, Twilight Sparkle.’
Night Light’s face immediately becomes flushed with deep blush as he read the letter, from his own daughter. “M-My daughter listened in on us fucking when she was younger? Wishing I was fucking her instead of my wife… That… That’s so… wrong… and hot at the same time. Why should I feel guilty about it? She has developed into a bright, smart and… dare I say this, sexy young mare I’m proud to call my daughter, but… why would I want to have sex with her? Despite her having such a curvy body, perky tits and… the lips of an angel…” he lets out a soft moan, setting the note aside and closes his eyes, beginning to stroke his cock, letting Twilight’s letter and her naughty words sink into his mind.
Twilight smiles as she looks in through the keyhole to her parents room and licks her lips as she watches her father begin to stroke his cock.
“Hmm, Twilight… You have the looks your mother gave you and you have my smarts… Damn, we did good…” the toned stallion moans and moves his hips, humping the air with his cock, thinking if his wife heard what he was saying, he’d be in so much trouble.
She smiles and then reaches down and slowly slides her fingers along the lips of her pussy before letting out a very low moan. ’Not yet Twilight... not yet.’
Night Light continues to please himself as he strokes his hardening cock, not aware of someone watching him masturbate.
The young purple alicorn shivers and then slowly stands up and then quietly opens the door, making sure she was as quiet as possible. “Daddy?”
The stallion blushes deeply and quickly covers himself up, doing his best to hide his erect cock. “O-Oh Twilight! Uh… it’s… not what it looks… like!”
"Don't worry daddy, I heard everything you said, and I love what I was watching. Would you..." Twilight begins and then slowly pulls down her dress and panties showing off her wet pussy. "Like to fuck me?”
His mouth opens slightly and licks his lips, seeing his daughter’s naked body beside thigh high socks with little pink bows on the top of them, along with seeing a bow at the base of his daughter’s tail. “Oh Celestia forgive me…”
She smiles as she walks forward and then slides onto his bed and sits on his belly, his cock sticking up through her tail. "Come on daddy... don't you want to sleep with me?”
“W-Well I’ve wanted to for a bit, but what would your mother…?” he begins to say before he looks into his daughter’s soft eyes, pressing a finger to his lips, allowing her to continue.
"She never has to know... it'll be just between us," She says as she shuffles her wings as she leans down and kisses her father's cheek.
Night Light shivers softly from his daughter’s soft kiss to his cheek. “Promise to keep it a daddy/daughter secret?”
"Promise," Twilight replies and then slides off his belly and then takes the head of his cock into her muzzle and sucks on it softly.
He moans softly and looks at his daughter suck his own cock in front of his eyes, licking his lips slowly. “Oh Celestia… Twilight…”
She smiles softly around his cock and then slowly sucks his cock down into her muzzle, before feeling it push against her throat.
“Y-You’re mother n-never… deep throats me. Oh shit…”
Twilight smiles and then bobs her head on his cock and reaches back with a hand and pushes a finger into her pussy.
“Oh, Celestia damn it… Why didn’t you come to me before, Twi?”
Twilight releases his cock from her mouth and looks at him. "I was scared... I didn't know I loved the idea of sleeping with you…”
“Why would you be scared? I-I’m your father, Twilight. Y-You can tell or ask your mother or I anything…” Night asks his daughter, kissing his thick member.
"Th-Thank you daddy," She says and then slides her muzzle around his cock again and then licks along the head of his cock happily.
“Hmmm, I love it when you call me that…” he says, being turned on by the title.
Twilight moans around his cock and then pushes down, his cock pushing deeply into her muzzle and against the back of her throat. Night shivers softly as he feels his daughter deep throat his cock, something his wife wasn’t capable of doing. “S-Shit Twi! H-Have you practiced this with your coltfriends?” he asks as he shuts his eyes. She looks up into his eyes and then holds her breath and then pushes his cock deep into her throat, managing to finally deep throat his cock.
“F-Fuck! Oh fuck!” he groans, holding his daughter’s head down against his crotch, the pleasure from her deep throating his cock proving too much to resist. She groans deeply and then pulls back once she began to run out of air. "Di-Did you like that daddy?" She asks with a smile.
“Oh fuck yes, I did Twilight. Your mother could never deep throat me like that. Did you practice that with your colt friends or something?”
"No coltfriends... just practiced on my toys," She moans gently and then grips the base of his cock and strokes it slowly.
“R-Really now? No colt friends with looks like yours?” he asks his daughter, surprised she’s never had a colt friend before.
"Nope... but I'm not too broken up about it. Only had sex once with a… friend with benefits. He was ok and all... but I only thought of you fucking me when my friend fucked me.”
“R-Really now? T-Tell me Twi, what toys do you use in place of a meaty piece of cock like m-mine?”
"I have a long dildo... but it's just not like stroking your long, hard cock daddy," She smiles and then licks her lips as she takes his head back into her muzzle.
“Hmmm, you’re a naughty little girl, you know that?” he chuckles softly and pets her head softly. “But you’ll be daddy’s little naughty girl… forever.” Twilight grins and then closes her eyes as he pets her head before sucking his cock down to the hilt, his cock pushing deep into her throat. The stallion moans deeply and holds his daughter’s head in place as he slowly pushes his thick member into her mouth, hearing her gag as it reaches the back of her throat. As she gags around his cock, she feels tears at the edges of her eyes and then feels her saliva sliding down his cock like small waterfalls.
“S-Shit Twilight! That’s a good girl! Oh yeah!” he groans, continuing to thrust into her throat, being turned on by her gagging and the tears in her eyes.
Soon she clenches her throat muscles around his cock and then pulls back so his head was the only part of his cock inside her mouth.
“Oh Celestia… Oh fuck Twilight…” Night moans, letting go of her head, allowing her to pull away from his thick member.
She pants heavily and looks into her father's eyes and then leans in a gives his cock a gentle kiss.
“Fuck Twilight, you’re just as horny, if not hornier than your mother. You can deep throat my cock where she can’t…”
"Really? I didn't know mom couldn't deep throat your cock," Twilight replies and then crawls forward and feels his cock push against her pussy as she straddles his hips.
“S-She can take it to her throat but… she gags when I-I go any further…” he moans, biting his lower lip as he places his hands on her knees, feeling the silk socks she was wearing for him.
"Unfortunate... thankfully I have some more skill.”
“T-That you do…” he chuckles softly before moaning more as her lips rub against his cock head. “Oh fuck, I… I can’t believe this is happening.”
Twilight shivers as his head slides against her pussy lips. "Yo-You and I both…”
Night Light pants softly as he pats his daughter’s flank with a hand, inches away from feeling her around his thick member. “E-Ever wonder how big I am, Twi?”
"Yes I have... will you tell me?" She asks as she shivers and uses her hand to grip his cock and tease them with her pussy lips with his head.
“A foot long and… three inches wide. Your mother LOVES it when I tear into her. She begs for me every time I slip my ring into her. She’s a total slut then…”
"Good daddy... because I think I'm a bigger slut than mommy.”
“Oh really now? You want to prove it to daddy, then?”
"May I?" She asks as she balances herself of her knees and looks down at their hips.
“Do the honors then, Twi… Mount yourself onto me…”
She smiles and then drops down onto his hard cock, shivering happily as his cock pushes deep into her for the first time, her body shivering with pleasure.
”Hmmm, fuck Twi! You're tighter than your mother! Oh Celestia!" Night Light moans and places his hands on her inner thighs as his daughter slowly bounces on his wide cock.
She moans happily and then clenches down on his cock with a lustful moan. "Th-Thank you daddy…”
“You’re… welcome, my cute and sexy little girl…” he grins at her. She moans happily and then presses down, his medial ring pushing against her pussy lips as she rides his cock.
“Tw-Twilight, sweetie?”
"Y-Yes daddy? What is i-it?" Twilight asks happily as she rocks her hips back and forward to move his cock around inside her pussy.
“How… How long have… you listened in on… your mother and… I?”
“I… honestly don’t remember. A while to say the… the least. I was so horny, I wanted any form of release and I heard you two that night…"
“S-So for a while then? Y-You ever peak inside at us?”
“A f-few times..." Twilight moans deeply as she rides her father's hard cock and bites her lip as his medial ring pushes deep inside her pussy making her squeal loudly.
“Hmmm, what a naughty daughter I have…” he chuckles softly as his hands rub her curvy flank, giving it a gentle squeeze. “Spying on her parents fucking like animals in their bedroom…”
"Can I b-be blamed? I lo-loved how go-good it felt to watch you fuck mommy raw..." Twilight replies with a moan and then clenches her pussy tightly around his cock and reaches forward and massages his chest.
“No, you can’t. Just curious about sex and all… which is a good thing,” he grins, feeling her massage his toned chest. “W-Want my ring inside you, Twi?”
"Yes daddy... fill me wi-with your cock!" She moans deeply and then cries out as she clenches as he thrusts his ring into her. Night nods to her and swiftly thrusts into his daughter’s pussy as his rings slips past her lips and into her tight pussy, making them both groan in pleasure. Twilight cries out as she feels his cock push deep into her as she clenches down hard around his cock as he fills her pussy... her pussy dripping with her juices as they slide down his cock and down onto his balls.
“Hmmm, feel good, sweetie? My wide cock and ring inside of your slick and tight lips?”
"It fe-feels so good daddy... like I'm being stuffed to th-the brim with your hard fucking cock.”
“Good girl… You… You don’t have to ask daddy for his cock. Y-You can have it whenever mommy isn’t around…” he says, a deep blush in his face as his daughter rides his thick member.
"Th-Thank you daddy... thank you..." Twilight replies happily as she rides his thick cock and feels her father's pulse in his cock. "Oh sweet Celestia…"
Night Light moans and licks his lips as his daughter’s perky breasts bounce in front of his face.
"Come here daddy... please su-suck on my breasts…"
“I’d love to…” Night leans in and takes one of her nipples into his mouth and suckles on it gently, running his tongue along her nipple while lightly pinching the other with a free hand as the other rests on her toned stomach. She moans happily and hugs his head close to her breasts as she rocks her hips on his cock, feeling it move around inside her tight pussy. "Oh daddy…"
The toned stallion continues to moan as he enjoys his daughter’s breasts, loving how soft and warm they felt in his touch.
"Th-Thank you daddy... this feels so good..." She moans deeply and then kisses the tip of her father's horn and then takes it into her muzzle and licks around the tip.
Night slowly lifts off of her nipple and moves to the other, careful as not to hurt his daughter with his horn.
"Oh fu-fuck daddy... please don't stop..." She moans deeply as she rides his cock happily.
The older stallion doesn't and continues with his tongue work on his daughter, loving the droplets of her sweet milk land on his tongue
"Thank you da-daddy... I'm go-going to cum!" She cries out happily around his horn as she slides her tongue along the ridges of his horn.
Night shivers softly, feeling her tongue work into the grooves of his horn, sending bolts of pleasure throughout his body.
"Ple-Please daddy... fill my pussy wi-with your cum!”
Without a second thought, Night Light gives a short thrust into his daughter which proves too much for him as he climaxes and shoots his fertile seed into his daughter, her tongue on his horn sending him over the edge.
Twilight screams around his horn and feels herself experience her best orgasm ever, better than when she fingered herself to peeping in on her parents fucking and better then her best toy. Her pussy leaking out of her in torrents as it covers his crotch. She groans deeply as she pushes herself down as hard as she could into her father's crotch, making sure none of his seed would escape from her pussy.
After for what seems like an eternity, the stallion slowly pulls away from his daughter and rests his head against the headboard, being exhausted from their love making. Twilight collapses on top of her dad and pants heavily... her pussy filled with his cum and her body tired from her best orgasm in years.
"Oh Celestia, Twilight! I... haven't had an orgasm that good in years, even with your mother as tight as she is…"
"Th-Thank you daddy. I love you so much," She replies softly and then kisses his chest softly. "That was the best orgasm I've ever had…"
"I'm glad it was.." He replies and pats her back, just under her wings. "Daddy loves you too, my little Twilight…"
"Daddy... you do realize that I'm on my cycle, right?" Twilight asks softly as she looks up into her father's eyes.
"You... You are?" He asks, his eyes widening a bit.
"Mmhmm..." She replies softly and moans gently, her pussy still throbbing a little from his cock inside her.
"What... What if I get you...?" Night is hushed by his daughter, pressing s finger against his lips.
"Don't worry daddy... I can keep it a secret. I can always say my friend with benefits got me pregnant.”
"Oh... Okay Twilight. If your mother ever found out about this, she'd kill us…"
"I know..." Twilight says with a smile and then kisses his lips softly. "She'll never know. Promise.”
"Pinkie promise?”
"Promise," She says as she looks at her dad with surprise. "Lucky my friend isn't here to hear that…”
"Why... is that?”
"Because she'd wanna throw us a party for this.”
"Really? Does she throw a party for everything?”
"Pretty much..." Twilight replies softly.
Night Light chuckles and slowly feels his cock slip from his daughter's cum filled pussy, letting her collapse to the side of him.
"Th-That was great…"
"It was Twilight. We... should do this again... soon," the stallion says with a yawn.
"I think so too.”
Night Light grins and softly kisses his daughter's lips. "You'll always be daddy's little girl to me, Twilight.”
"I always hope so daddy..." She replies after kissing his lips back gently.
"I know so, my princess.”
Twilight smiles and then yawns as she closes her eyes slowly.
“Sleepy?"
"Yes daddy…"
"Come on, sleep with daddy and have pleasant dreams..." He says, allowing her to lay on her side and rest her head on his chest.
"Thank you daddy..." Twilight replies and then rests her head on his chest, listening to his heartbeat as she falls asleep.
"Rest well my little princess. Daddy loves you..." Night Light grins and kisses her forehead as she coos softly next to him, slowly falling asleep next to his daughter. As Twilight sleeps in her father's embrace, she shifts a little in her sleep as her father's sperm moves inside her to find an egg that was lose inside her body, firmly impregnating it, starting a new life within her.