Oh Angelina. He wasn't exactly sober himself, but he wasn't at the point where he would need any help getting home. Though he might just claim it so he could get up close and personal with a pretty party goer or two.
He didn't expect the kiss, at least, not quite so unexpectedly, so he stumbled back a bit, before catching himself and grinning against her lips. If she insisted, who was he to refuse?
Getting into the spirit of the birthday snog - because they were indeed important for such an occasion - one of his hand found its way to the back of her head, while tangling his fingers in her soft hair. His other hand pulled her closer because he was planning to make the most of the kiss and he could hear the catcalls start up around them.