should I lean in for HER kiss?

If you think that there might be something there, then let her know. Hint at it first. If it seems to kind of freak her out, then let it go. But if she goes along with it, talk to her and see what she thinks about that situation.

BUT I'm 100% straight, and I do the same things. I even kiss my girlfriend on the forehead or cheek. So I dunno...it seems normal to me, but if you feel different about then try talking about it.

yeah that's the same behaviour that my friends and i have with each other. at this age you just want to experiment and wanting to kiss your friend just to see is pretty normal. i've kissed a girl before and it really meant nothing. i love guys to no end. so i say you should hint it, maybe be drunk at the time, then go for it. just to see. you never know.
-A

go for it girl! if u tell her how u feel, it might scare her away, but maybe if u just go for it and kiss her, shell be more reseptive! honey, ive had these feelings before, and i regret not acting on them! you may regret this the rest of ur life, so just do it!!!!!

*~peace and love~*