Quote:
There is no obsession here...
This would not help me right now, she is not the kind of girl that fucks before being boyfriend and girlfriend...
I've heard that line from girls so many times that i've lost count. It's interesting that the same girls are often miraculously incredible at sucking dick too

They obviously learned it all in Sex Ed.
Every girl, at some point in her life, is "that kind of girl". You probably framed yourself as boyfriend material and she is going along with it and falling into your frame, because you're a nice guy and it's congruent with your personality. Girls will always quickly assess you and decide whether to 1) avoid you 2) friend zone you 3) consider you boyfriend material and 4) just fuck you because you make her so wet and horny then see what happens.
I'm not criticising your desire to make her your girlfriend. I'm saying building a sexual relationship with her is the quickest way to form an emotional bond with her. Kiss her, then with tongues, kiss other parts of her body, touch her, remove your clothes, remove hers, rub her clit, finger her, get your dick out. Get the job done, son. Stop worrying, she clearly wants you and your cock.