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Should I just say to her come over and we'll have sex?
Not that, it's better in general not to verbalise it

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Basically all you have to do is get her in the bedroom then start making out with her. It probably seems all hazy and directionless because you're a virgin. I remember when I was a virgin the first time I layed a girl at 15 in a field I was like trying to find her hole etc. It's a bit like kissing. There is no 'procedure'. You just go with the mood and 'do it'.
You can do the movie thing if you want but personally I think there's no need. That's good for plausible deniability, but since you two are official you can just go caveman on her. Doing the movie thing will only build up your nerves and you won't know when to awkwardly move closer.
Basically get her up to the bedroom with some excuse like you want to show her your cologne collection or your new tie or something stupid like that (a movie is a lot of time to pay for just to get her up to your room), then show her whatever it is whilst holding her waist. From there you can either give her the bedroom stare and just go in for the kiss, or steadily escalate kino until you kiss.
From making out and groping each other it's easytime to lay her. Just throw her onto the bed and start making out on top of her and escalating, rubbing her pussy etc etc. You know the rest. Make sure to stock up on Johnny's.
You may find it awkward or may not be able to find a way to get right to it. If this is the case you really just have to break through the ice and 'do it'. She will thank you for it. She wants you to lay her, not the other way. So make sure you lead and man up
Have fun!