When I was 18 I used to live in a shared house, with 4 guys. We used to go out as a group once or twice a week and I used to get really, really hammered yet when I went out with my friends this would never happen. One night in an absolutely hammered state, I was apparently hanging over the kitchen table with this one guy (who was a lot older than the rest of us) with his hands up my shirt and he was pulling my skirt up when another housemate walked in. I had had 4 pints of fosters. I to this day remember nothing of this night, the other guy dragged the guy feeling me up out into the garden and well, punched a few times, then came in and put me to bed. I never reported it, or even went to the doctors, despite a couple of the guys I lived with urging me to, I still had a nagging doubt in my mind that maybe just maybe, I was drunk.
A few months late a friend of a friend went on a date with the didgy guy, she came too with him putting his clothes on, she went to the doctors and went to the police and the guy was arrested and convicted of raping her.
I think if he has nothing to worry about it wont bother him. Lets hope nothing untoward was going to happen to you.