Kirley knew Sirius was drunk. He was drunk himself. Drunken hookups were a way of life as far as he was concerned, and maybe he'd been hooking up with Sirius a bit more than he usually did with one person, but that was mostly because the options here were limited. Sirius was a good fuck, and he genuinely enjoyed his company which was weird in and of itself. He knew that things could get sticky, and not in the fun way, but so far Sirius had seemed to understand the boundaries.
It was hard to think of them now, when Sirius was so eagerly kissing back as Kirley held him against the wall. His body was firm in all the right places, and there was an urgency to the way he gripped at his belt. Kirley responded in kind, placing teasing bites down the length of Sirius' neck as he worked to get their clothes off.
There was a small voice at the back of his head, that sounded a little bit like Albus Potter, that wondered if they were moving too fast, if Sirius might be too drunk for this, but Kirley ignored it. Just a remnant of being someone else, and having a lengthy conversation with that someone else earlier. Sirius was no drunker than Kirley was.
"Too many clothes," Kirley said, pulling back enough to grab his wand and banish their clothes to Hell for all he cared. He tossed his wand behind him, heard it clatter to the ground, but he was too busy kissing Sirius again, biting his lower lip, to really care about where his wand ended up. "That's better."