Too drunk to remember

A very straight friend of mine got into a bad situation some time ago where he came home to an empty house because his girlfriend of a few years had cleaned him out while he was at work - took everything and disappeared. He ended up moving in with me (at this point I told him I was gay). We flatted together for a while and often, often would drink quite a lot together.
One night we were pretty drunk at home and he said he had a sore back. I said did he want me to give it a bit of a massage - he was very reluctant but also drunk and said ok. I somehow asked him to take his pants off also (so just in jocks/briefs). I get some oil saying I didn't want to get it on my clothes so was then also in just underwear. I know that I massaged him but actually don't remember from this point until I woke the next morning in his bed next to him. I went to get out and realised I was naked under the blankets and froze - I looked again and so was he. I remembered nothing. I panicked (he's a pretty rough guy) and he woke up. I said are we still ok and he said yes. He knows what happened leading up to this point but I never asked him what we did and I still don't know. I then decided to touch him and give him a kiss and he kissed me back and we just hugged for a bit and I started touching his body. I pushed him over on his front. He had a hairiest arse I've ever seen. I had trouble finding his hole but he was happy to let me rim his arse. When I tried to finger him he turned back over and said no, nothing is going up there, so I sucked his cock until he came in my mouth. I left his room and we never did it again.