Now don't get shocked. I loved what I saw. ASR has totally understood and accepted his love for Khushi and he is trying to make her confess ' farq padhta hai'. ASR did have a naughty glint in his eyes, but it looked to me that it's the same glint bf's/hubby's have while they are full on teasing mode.
At some point in the show, ASR was bound to realize his love and I think this is the best time. If the man has accepted his feelings, what's wrong if he all set to pursue his lady love?
I don't think the kiss has any hidden agendas or anything. ASR has already 'almost kissed' her once, he backed out because; he didn't understand his feelings. Back then, It was head against the heart. Now he is free. He has realized his feelings. He is not tied to La. Nothing is holding him back. Why shouldn't he go for a kiss?
If anything is driving him, it's passion. He doesn't need to be high on alcohol or anything else. If he is high on anything, it's love.
KKG was totally turned on after that passionate dance. No wonder she locked herself in the room and hyperventilated. Any normal female would be. She might be surprised or shocked by the kiss, but I doubt, she'll get mad and attack him. She might run away though after she gets back to her senses.