About a week ago I went with several friends to party. Well, after we all got trashed we split up and went to 2 different houses. I went with a female friend and a guy that is like my little brother to my female friends house. When we got there I decided to take the couch and my "little brother" decided to crash on the recliner. Once my other friend had gone to bed, my "little brother" kept reaching over the couch and stroking my hair. I finally woke up enough to ask him what was wrong. He told me that he was really horny and wanted to fuck me. I told him no because he's a virgin, he's like my little brother, and we would both regret it the next day. Then I suggested that he just sleep it off. He kept asking for about 2 hours, on and off. Finally I gave in and had sex with him. Little did I know that he wouldn't regret and want to forget it. Now he calls me all the time to "talk about our relationship." I just don't know how to tell him that I don't want a relationship. All I want is forget about what we did and let things return to normal. How do I get past all of this without hurting someone I care a lot about?!