(Prompt: Last night, two ponies kissed for the very first time. What happens today? )
Some mornings, it just wasn't worth waking up.
Birds chirped merrily outside his window, and the morning sunlight streamed in, lighting the room in a cheerful, warm glow. A cheerful, warm glow that seemed to drill picks into his brain. Yes. Yes, last night must have had rather a lot of drinking. How unbecoming for a stallion of his station.
It was then, through the slowly fading pain of waking up in a beam of sunlight, that he became aware of the snoring. A mare, then, he thought through closed eyes. He folded a foreleg over his face to keep the sun out. He listened to the snoring. Yes, definitely a mare. Good then that he hadn't been quite drunk enough to make that particular mistake again. Still, tongues would be wagging this morning, he supposed. He didn't usually go for the mares that were unladylike enough to snore, but one couldn't always tell before one took them home.
It wasn't unusual for him, waking up next to a pony he couldn't quite remember. Being a prince did have its advantages, after all. Blueblood lifted his hoof a bit and let a slight bit of light in before wincing and resting his pastern over his eyes again. No, sunlight would have to wait. As much as he loved his dear Auntie Celestia, she did often raise the sun rather too early for him.
He cast his mind back over the previous night. What had been the occasion again? Ah yes, the new Lunar Ball. Well, that left the field rather open on who this mare could be, didn't it? Ponies from a number of social strata had been invited. The typical socialite nobles had been in attendance, of course, as well as some of the more promising nouveau riche families. A representative portion of the Wonderbolts had visited as well, though in Prince Blueblood's experience, a Wonderbolt usually left him a bit more sore.
Though there were wings, so she must be a pegasus. He distinctly remembered wings. There were a few pegasus ponies of suitable status in Canterlot that he wouldn't be too disgraced to be seen with leaving a party. Hopefully this was one of them, and not one of the ever-hopeful underclass that would feel so terribly scandalized by spending the night that he'd have to spend a small fortune in bits to keep them quiet about it.
The sun was far too bright this morning. He almost felt compelled to submit a formal complaint. Still, he removed his hoof from his eyes and let it fall heavily back to the bed. A few moments of pain and his eyes adjusted to the brightness, even though he kept them closed. Yes, it was unusually bright today. The Lunar Ball must have gone well for Auntie to be in such high spirits.
The snoring had stopped. Lovely, here came the worst part of any of his morning afters. A voice spoke beside him, groggy and quite unlike any noblepony he knew. "Huhwha? Nng, my head hurts. Spike, make some coffgggh..."
The mare seemed to drift off to sleep again, while Prince Blueblood's entire body went tense at once. He knew that voice. He knew the name 'Spike'; it was so uncommon for a pony. It wasn't a pony's name after all, it was a dragon's. There was exactly one pony that would be asking him to make coffee, and it was definitely a pony he shouldn't be hearing in his bed. Prince Blueblood turned his head to the side, and caught a glimpse of quite familiar purple feathers, and a protruding horn.
His stomach leaped into his throat, and it took quite nearly all of his composure to keep all the drink from last night down. He squeezed his eyes shut again. It wasn't that she was unattractive, it was that Auntie Celestia was going to quite literally kill him. What in Equestria had he done last night? He kept his eyes closed, though despite the sunlight bearing down on him, he didn't cover his face again.
The Ball had been going swimmingly, he'd been drinking... yes, wine he supposed. Oh yes, this was one of her first formal events as Princess. She wouldn't have been used to the quality of beverages, or the strength behind their subtle flavors. In fact, now that he pressed himself to remember, he could recall Auntie asking him to keep an eye on Princess Twilight, to make certain she didn't drink too much. Obviously that hadn't worked.
The night had drawn on, she'd plainly had rather too much, as had he. There had been a carriage ride, his driver not even asking if he wanted to leave the mare at the castle. He could recall snippets of stumbling through his mansion, laughing and leaning on one another for support, and then... hm. A kiss was all he could remember, just one before the collapsed into the bed. He certainly hoped that was all that happened, more for his own sake than anything. He didn't feel... sore, or drained, or anything of that nature.
Prince Blueblood turned his head and opened his eyes in a squint, blocking out the brilliant sunlight as best he could while still managing a look at the pony beside him. Yes, purple coat, feathers, horn, pleasant if low-class little stripe in the mane; it was quite obviously Princess Twilight. He prodded her side lightly with a hoof. "Princess, wake up. You must get out of here."
She batted his hoof away with hers, and squinted her eyes closed, only to open them a moment later. She cried out and squeezed them closed again, wincing from the sunlight. "Agh! Where am I? Why's the sun right in my eyes?"
Prince Blueblood rolled over again, laying on his back with his eyes closed while Twilight woke up, and simply listened to her talking.
"Ugh, my head! Wait, whose bed is this? Agh! Prince Blueblood?"
He kept his eyes closed, and frowned pointedly. "Yes, calm down. Nothing happened, Princess. But you absolutely must gather your things and go back to the castle before-"
Twilight's voice was suddenly a strange mixture of happy recognition and very poorly hidden panic and humiliation. "Princess Celestia?! What are you doing in here?"
The now quite certainly Ex-Prince Blueblood's eyes shot open, and he looked to Twilight, and then followed her eyes to the tall, white, and positively glowing Princess Celestia standing a few feet away from his bed. She stared at him with eyes like burning embers, and he sat transfixed by them for a moment, before falling back to the bed in utter resignation.
Yes, some mornings it just wasn't worth waking up, even if he wasn't sure he'd quite get to see another one.