Prompt: a midsummer night
"Emiya," Issei intoned, bowing so low that his head nearly touched the floor (effectively hiding his faint blush), "I would be honored if you would accompany me to the festival this evening."
Shirou blinked, wondering why his friend was being so formal all of a sudden. "Okay."
"'Okay'?" Issei echoed, straightening up. "That's all? You aren't asking why I want to go with you or what's gotten into me or anything?"
"Not really." Shirou shrugged and smiled foolishly at his friend. "It sounds like fun."
"…Well," Issei said to himself. "That was a lot of panic and worry for nothing…"
The festival had not merely "sounded" like fun. When Issei and Shirou left, it was a good deal later than they'd planned to and with great reluctance.
Now they stood at the base of the stairs of Ryudoji.
Issei fidgeted nervously before beginning to speak. "I quite enjoyed my evening, Emiya. Could we do this again sometime?" he asked.
"Sure," Shirou agreed, still not understanding Issei's nervousness at all. "Just tell me when you want to do something."
"I will, Emiya."
Then he leaned forward and pecked Shirou on the lips.
Shirou gaped openly, struggling for a few moments before he was able to squawk out, "I-Issei!?"
Now it was Issei's turn to look confused. "What? That shouldn't be that much of a supri… oh. I knew it was too easy." He cleared his throat, his blush obvious even in the poor light of the streets. "You thought this was a friendly outing, didn't you? I apologize for not making it clearer that I intended for it to be a… a date."
"A… date." Shirou struggled to wrap his mind around the concept.
His good mood now gone, Issei bowed. "Please accept my apologies, Emiya."
Shirou stared down at him. "N-no, that's okay… If it makes you feel any better, Issei, I would've been just as surprised if you'd been a girl who invited me out and then kissed me."
Issei chuckled. "I… suppose that means we won't be doing this again, after all," he said quietly.
Shirou paused, looking thoughtful. "…I didn't say that."