jerk off the morning before school. you'll be prepared to go up in her for a longer time. this is true for most guys. the first time you do it, you're gonna bust earlier than you would if you did it the second time. seriously, give yourself some "time alone" early in the morning before school, and just don't say anything about to anyone. your girlfriend doesnt need to know. she'll just be really happy when you start doin your thing and you just keep going and going.
one other important thing, dont rush it. dont go too fast too early, because you'll be tired and you wont be able to keep going. that happened to me on my first time. i got tired 30 minutes into it and had to stop. i was slightly bothered, but thats when you tell her to do some "other" tactics.
have fun. and if youre gonna go in raw, for your sake and your (future) childrens sake, put on a condom about halfway through it. theres no guarantee that pulling out works every time.
