He didn't know what it was about her. Maybe it was just tonight, and he felt the need to be close to someone. Or maybe internally he really was drawn to her, but he really didn't want to be pushed away. He was well aware of how she probably felt about him, that he was a slimy git, but slimy gits usually didn't get the girl to kiss him back. Oh, and she was kissing him back.
He covered the hand she had to his chest with his own, while using the other one to tangle in her hair to bring her closer. He really wasn't sure how long this was going to last before she snapped back into some sense, but he was going to take full advantage of it. Her seriousness just appealed to him in a way he could not fathom. It was the perfect foil to his 'fly by the seat of his pants and spend all the money you can' way of life he had going on. Though of course, that would never be admitted out loud. That was more of an inner kink he had.
She tasted good, and he ran his tongue gently along her lower lip, hoping that he could get a few more moments out of this. Hell, maybe she was enjoying it just as much as he was. And whether or not she did end up slapping him in the end, he can say with honesty that it was worth it.