Alfie's brain shut down. He knew he shouldn't do this, and something drunk and sluggish wanted to pull him back - but about that time he felt the tip of Stu's tongue on his lips, and his brain literally shut down, body working on instinct as his own tongue moved just as forcefully as the rest of the kiss had been to claim Stu's mouth.
And this felt wrong, because Stu was compact and hard bodied and not soft at all against him, but somehow that didn't lessen the fact that he felt like growling against his mouth and snogging him until he couldn't breathe.