This makes me believe you're younger than you say you are...
Tell him you want to eat her out.... i mean take her out to eat
I said him , haaa...GAAAAAAAAAAAAAAY
Okay ask her if she's doing anything for the weekend (or whatever day you wanna chill) and then if she says no just ask if she'd like to go to a movie or dinner or (whatever you want). Just be confident and nonchalant (: good luck!