god dude you dont even know.... i am pretty much in the exact same situation as you, im 16, in the tenth grade. and my best friend who is female, a good looking one at that, have had experiences like that, the difference is, she has a bf, has had the same one and she comes over sometimes and we end up doing "stuff" weve never actually had sex, but pretty much everything else. this has been going on for about 5 months now... and for the first few i felt the same way as you, but then i just realized that i was her best friend that just so happen to be somewhat of a booty call.... but im not complaining.