How to have sex again?
So I have been hanging out with the girl I had sex with last week in recent days. Not awkward at all; we're still having fun as we did the night we met and did the deed, almost like nothing's changed. However, neither of the two days and nights I've hung out with her were spent alone with her: there was always a friend or two or three. Aside from a flirty comment or two, the way I've interacted with her in those days and nights had no real sexual overture.
This has gotten me to thinking that might be the only time I have sex. I'm not sure how to aim it at having it again with her, which is essentially going to be my only shot at it again the rest of my life. The one playing card I had (being a virgin at my age) is now gone so I suspect I would no longer be sexually interesting to her especially in light of possibly friend zone'ing myself in those days and nights.
How do I have sex for the second time and possibly many more times after?
"1,2,3,4.....The highway's jammed with broken heroes on a last chance power-drive!"
"Glory days/Well, they'll pass you by/Glory days"