What happened

I need to tell you what happened to me, otherwise not everything that happened after the first Sunday at the police station will make sence.

What happened to me was not rape in the traditional sence you normally read about. But it is the definition of rape and it has shattered my world as I know it.
I went to a pub one night with 3 friends, and met a guy who was there with 3 friends also. I didnt really talk to or register any of his friends.
I went home with the guy in the end of the night. No problem there, I knew I went home with him to have sex with him, and so we did, all consented. We then fall asleep next to each other. At one point in the middle of the night I wake up cause I can feel someone is inside me, and I assume that it was the guy I went home with. I then open my eyes and realise that he is still sleeping next to me. My only thought was "if he is sleeping next to me, then who is inside me?" I turned around and saw someone I didn't recognise at all, a stranger who was inside me, while I was sleeping. I managed to push him away, and ran upstairs to their bathroom. I can't even describe the feeling of shock and confusion about what just happened.
I was quite drunk, or probably more hungover at this stage and I didnt know where I was or how to get home, so I went back down to the room and  moved to the other side of the guy I went home with, next to the wall, thinking I would be safe there.

I fell asleep again and woke up in the morning when the guy I went home with was going to work, I was still really dazed and hungover but I remember him waking up and speaking in Italian(they are both Italian) to the other guy, and he didn't even seem surprised that he was there.
Why didn't he wonder why this man was in bed with him and me?

Anyway, I am not sure why I didn't get up and leave at the same time as him. I was still feeling so tired, and maybe I didn't want to deal with the confrontation. Maybe I was hoping they would both leave.
But G didn't leave. A bit later he heard me moving so he came at me from behind, trying to pull down my panties and telling me, "come on baby, you know you want to". I told him no repetedly, and he was grabbing quite hard, but I could push him away to get out of bed and run out of there.

I later found out he was actually the BROTHER of the guy I went home with. No words can describe the sickening feeling I had when I found out that it was his brother.. What a sick man does that with his brother in the bed.