How do you do it? I want to hear personal accounts.

I've been talking to a girl in my school for almost 3 weeks (hella IOIs from the start, basically begging me to touch her ass etc) and the other day I realized 3 weeks is pretty long to go without trying to fuck, so I told her I'm going to a small party next weekend and she should come, she agreed.

I'm going to see her every day in school until said party, how should I proceed till Then? I sit with her on the bus and tease and flirt with her (pull her bra straps, hand on inner thigh etc) should I just keep on till I get to fuck her? How should I establish that I wanna fuck her at this party?

Thanks for any advice