Um, well I don't think you really should kiss him until you're sure he likes you, I made a big mistake last year, I kissed my boyfriend of 14 weeks, and that was my first kiss gone, just like that. I think that... (I know I am very old-school) but I think you should text him or write him a note in class, as anonymous, and just ask who he likes. I went out with a guy who my best friend liked and when he chucked me I lost my friend and my boyfriend. So, all I'm saying is choose wisely.
kiss her
By the passion in the kiss you receive... ;-)
kiss her
If he likes you and your his girl friend then yeah.
do it do it do it!
Kiss him.
Consider that maybe the girl only considers you a friend, and therefore may not want to kiss you. If you feel like your more then friends then the best way to approach a kiss is to find a reason to look into their eyes, lean in and see how they react. If they lean in, to proceed with the kiss, if not abort the kiss and either try again later or give up on that particular girl and move on.
yes
kiss him in his balls
It means she likes him and if you kiss him this means that you know she likes him so leave him alone she feels annoyed because she likes him. That you are children and she is annoyed.
It means that he likes to kiss girls
Just kiss him and get it over with... or find out if he likes you then if he does go for it