It happened to me twice. I knew I had to leave so I was naturally aloof and bold, and this created attraction in the girls. First time I said to the girl that I was leaving and things worked great anyway: we were both sure of the reciprocal attraction, and I came back to see her (read:fucking the hell out of each other) more than once.
Second time I didn't say I was leaving. Banged the girl anyway. Didappeared without saying anything, coming back two weeks after and keep banging. But she sensed something and started put less passion in sex, so things faded away.
So my humble advice is: if she doesn't know you have to leave, stay. If she knows... well in this case if she is a good girl genuinely into you, you can have a talk about it and see what comes up. If you think she's a slut... be careful because staying only for her may result in her thinking she is too good for you ecc., with all the consequences we skilled players know.
Second time I didn't say I was leaving. Banged the girl anyway. Didappeared without saying anything, coming back two weeks after and keep banging. But she sensed something and started put less passion in sex, so things faded away.
So my humble advice is: if she doesn't know you have to leave, stay. If she knows... well in this case if she is a good girl genuinely into you, you can have a talk about it and see what comes up. If you think she's a slut... be careful because staying only for her may result in her thinking she is too good for you ecc., with all the consequences we skilled players know.