Silver felt anxious and squirmed to show it, but he didn't want to just accept it. He gently wrapped Fast Change in his silvery magic and pulled his wife/husband up close. "I really want to get to know Rough. He's waited for this."
Fast Change flashed a smile as he nodded. "Far be it for me to get in the way of you two, just don't ask me to go." He slipped free of Silver's magic and stepped aside. He made a little 'go on' motion with a hoof and looked between Rough Tumble and Silver Stars.
Rough rose up to his own hooves, but looked uncertain and confused. "You don't have to do this, for me."
Silver stood to his full height. He was taller than Rough Tumble, just a tiny bit. He remembered when he was smaller, when Rough Tumble towered over him imposingly and was a threat. Silver spread his wings wide, becoming all the larger for it. "Rough Tumble, you are my guard captain, act with the dignity that entails. Now, I'm going to do horribly invasive magic that will make you hornier than you ever imagined. This is your last chance to turn it down."
Rough's eyes went wide. "W-what? Horny? I'm an earth pony."
Silver put a hoof over his face as Fast Change burst into giggles. "Aroused, sex saddled. You will be my stud, our stud. Are you prepared for that?" Rough was blushing brightly, but nodded and tried to stand straight.
Silver reached with his magic and harmonized with Rough's body and magic, slowly learning its gentle pulse and layout. He didn't use the unicorn alphabet, instead relying on his growing skill in channeling, but it wasn't his own magic. He gently got Rough's magic flowing, hotter and hotter, coaxing that powerful earth pony magic to motion.
Rough began to pant and squirm at the new sensations. He looked curious and scared, but he didn't ask Silver to stop or flee.
Just as the bangle on his jewels had done to him, Silver took a firm hold of that flowing essence and channeled it down between Rough's legs as he went in for a kiss. Rough snorted with surprise, both at being kissed and the sudden bloated pleasure that was still growing in intensity between his legs. He grew thick and ready in a few quick thumps of his heart as he sank deeper and deeper into an unnatural rut.
Silver undid the balance between his artifacts, causing magic to flow sharply to his own loins. He grew erect, potent, and horny. He wanted a mare, but there weren't any of those around, just two stallions...
Fast Change licked over his lips. "You two are looking quite... ready." He flicked his tail as he came closer. "Shall we?"
Rough shook himself out and pawed at the ground. "I want... Yes!" He started to circle around, but Silver snorted loudly.
It was the snort of an angry alpha male. "I'm not the bottom." There were still some limits. Silver stomped as a thin line of preseed sprayed to the ground. "I'm ready to top though."
Rough licked over his lips. "One thing... first." He ducked his head down and gently nuzzled the flared head of Silver's member before he licked over the heavily leaking tip and sucked it a moment, welcoming that throbbing flesh into his snout and working it over, much to Silver's delight.
"More for me," proclaimed Fast as he hopped up on Rough from behind and hugged him tightly. He worked himself into position, nudging at Rough under the tail until the mark was found and he began to carefully pry Rough Tumble open with a ready shaft. Tumble groaned around Silver's member as he was filled and pushed himself a few more inches down around the big horse cock he was teasing.
Silver felt pleasure and jealousy well at once. That other stallion was claiming his partner! But it was no random stallion... That was Fast Change and he/she could be quite a pretty mare when she wanted to be. Silver spurted a thick gob of sticky prefluid into Rough's snout as he worked through it.
Fast Change had no such heavy thoughts, just heavy thrusts. He knew exactly how hard and fast to move, and took Rough Tumble with quickly increasing motions that had the stallion grunting in pleasure. Rough sank further and further along Silver, slowly taking the member up until the medial ring and kissing it around it with the promise of more coming. Silver thrust against Rough, pushing in past the ring and forcing Rough to snort for air through his nose.
"He'll do anything you ask, right now," whispered Fast Change as he pistoned into Rough Tumble.
Rough wasn't in any condition to ask anything, with his snout full of horse cock. He worked himself further and further down, stretching his throat and barely breathing by the time he was able to kiss Silver's furry sheath, the entire length inside his tight throat. He swallowed and his muscles grabbed and pulled at Silver in a powerful ripple.
Silver put his hooves to Rough's head as he thrust against that willing mouth. Unable to hold back from the intense feelings of it, he began to fire. Thick jets of virile alicorn seed began to flow in powerful spurts right down Rough's throat. He quickly reached full and pushed beyond it as his belly swelled a few inches visibly. His lips became splattered with cum as it washed back up in an overflow and Silver drew back, just as hard but slightly satiated.
Fast pulled back at Rough, plunging deep into his ass and letting his own member unload, flooding the submissive stallion's bowels with heat as he sighed with satisfaction. "It's not too late, Rough. Go on."
Silver perked at ear at Fast with some confusion before looking at Rough evenly. Rough licked his lips and shook himself, still speared on Fast Change. "T-turn around, and trust me."
Silver went rigid. Even in his addled state, he knew exactly what was being asked of him. Could he do that, just trust? He leaned in and rubbed noses with Rough Tumble gently. "I will... trust you, please, be careful." As a human, he had known only pain. Perhaps, as a pony, with two loved ones, he could find something different? He turned away from Rough Tumble and looked over his shoulder.
Rough Tumble trembled and pulled forward, only to be drawn back by Fast Change. "He said be careful, that starts with talking nice to your first partner before rushing off."
Rough looked over his own shoulder and nodded shakily. "Y-yeah, sorry. Please? Can you help?"
Fast Change flashed a grin. "I was hoping you'd ask that." He hopped down from Rough, pulling from him along the way smoothly and nuzzling his flank. "Slow and gentle. There's no rush."
Rough moved up to Silver and nipped at his cutie mark, making Silver squirm in anticipation and a little pleasure. He hopped up onto Silver, hopping into position and pressing his member against the tight pucker of Silver's back entrance. "Relax. Trust me and relax."
Saying to trust, and actually trusting, there was a difference, and Silver felt it. He was tight, too tight, and letting go felt impossible. Suddenly he felt a gentle nuzzle and opened his eyes to see Fast Change, as a mare. "Come on, my stallion. You have a job to fulfill. Let him have your ass. Your cock's going to be too busy to care."
She nuzzled his twitching pole before turning around under him with her tail hiked high. "I've waited months for you, Silver. Don't hold back. Fill me with a thousand foals."
Silver shivered. The logical part of his brain doubted Fast wanted a single foal, let alone a thousand. The rest of him told his brain to be quiet, and quickly thrust into her offered vulva. The talented shapeshifter was delightfully tight in just the right places. She rippled and milked at him, and he was quickly lost to the utter rapture of rutting her. He almost missed when Rough pushed in. Almost.
Rough's flared head pushed slowly through Silver's anus and began spreading his insides as Silver let out a loud whinny at the new and alien sensations. They slid together, the three lovers bound by one tense length of masculinity that started at Rough's groin and worked up into Fast's clenching cunt. The motions were clumsy at first, but they began to feel each other, and the patterns evened out, with Silver rocking back into a thrust just before plunging deep into Fast Change.
Rough's motions became smoother and faster as his partner became more used to being filled. It was like a dream, having Silver that way, to know he had accepted it without trickery or force. He hugged Silver from above and behind as he pushed into him, balls lifted, ready to unload. He tried to hold it back, barely keeping it at bay as he waited for Silver to release first.
Silver rocked between his two lovers, lost in two pleasures, one of them so alien. The oddness of it rubbed in him and excited him even as he danced over Fast Change. Rutting the mare took him to the edge quickly. He wanted to seed her, and didn't hold back. One last strong push got a grunt of pleasure from her before he began to flood her with virile seed, only to be suddenly filled himself. The shaft held in his rump jumped and bucked as warmth flowed into him. He could feel Rough's balls pressed against him and suddenly giggled. He was officially gay, or bi, considering he was balls deep in a mare at the time. It wasn't nearly as terrifying from this angle.
Fast Change wiggled her rump softly. "I know you can go longer than that, Silver. I'm not done yet."
Silver softly nipped at her shoulders. "You're never done, you insatiable succubus."
Rough gently nuzzled at Silver's ears. "Are you alright?"
A knock came from the door before Twilight entered with a tray of something that soon hit the floor and made a mess. "Oh! Sorry!"
Fast Change half-lidded her eyes at Twilight. "Oh you're going to be sorry. Close that door, come here, and present, my little nerdy mare."
Rough quickly scrambled off of Silver at the sight of Twilight, blushing and trying to compose himself to some semblance of dignity. "P-Princess Twilight. Hello."
Silver nuzzled gently at Fast Change. "I like the way she thinks. Come here, Twilight."
Twilight approached hesitantly, tail swaying with each step. "I didn't mean to intrude on your personal time. I thought you'd still be enjoying the day before you got to, um, that part. So... how did everything go?"
Fast Change smirked. "Smooth topic change, but it went well, thanks." She shook her rump. "Mmm, I'm still filled with some of the results, but you've waited as long as I have, so prepare yourself, because you're getting rutted."
Twilight went red quickly. "He doesn't have to! He just finished with you. He has to be tired."
While that might be true at other times, with his artifacts set to flood his loins with his magic, he felt quite ready to rut them both to unconsciousness. "Twilight, present yourself." He turned to Rough. "And you, that was... it was good. I'm happy you were my first. Let me take care of her, and we can resume our date."