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I usually have a game plan but i dont want to fuck this girl, she is far more valuable than that and is girlfriend material
Well think of it like this. Do you want some other guy to have sex with her???
Don't put her on a pedestal
Plus sex isn't the end of a relationship, it's the beginning. As long as you treat her like a girlfriend than having sex with her isn't an issue. it should still be there as a goal you have in mind with girl.
I would suggest you show her your interested and want her and not afraid to lose her. Be more sexual. Invite her over, watch a movie and escalate on her. get her out of a social environment and work on her one on one.
Example: "let's do XYZ together what day is good for you?"
Because what you don't want is to simply be her friend or even worse completely forgotten about, because you were simply to nice and polite. You don't want her to think " yeah his is a really nice guy, but I wouldn't sleep/date him".
Escalation is your weapon when it comes to seduction. You need to learn how to use it.
Good luck brother that's my 2cents.