I think its sort of a black and white issue on the rape thing and thats a pretty harsh accusation given she was into it at first but I don't know all the circumtances. The main and most important point is you should have stopped the first time she asked you, it was selfish and 100% wrong of you not to. I wish guys would walk in a girls vagina for a day and realize how painful sex can be for us at times.
I think you need to apologize up the wazoo and assure her your intentions were selfish but not with intent to harm her. PROVE it by not getting drunk and acting that way. Be considerate of her body from now on. You also need to realize that if you really care about this girl, sex isn't just about you getting yours.
So, so you think you can tell Heaven from Hell,
blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?
And did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
And did you exchange a walk on part in the war for a lead role in a cage?