How Will I Face Him Tomorrow?

I don't have many friends. Basically just two girlfriends and I hang out all the time. I can't believe what just happened tonight, but it actually happened. Us 3 girls were playing music and drinking in my room. In Australia we can legally drink from 18. We didn't drink all the time but we had fun when we did. We had all seen each other naked. We had even seen each other having sex, never participating with each other in that way. My brother is 22 and lives at home. Our parents were out for the weekend. My girlfriend Kelly, has a thing for him. She has wanted to fuck him for months. She flirts when she gets the chance, but he either misses it, or ignores it. She's always going on about how good she says it will be to sleep with him just once. Earlier tonight, my brother was in the shower. We knew he was because nobody else was home and the shower was going. Kelly got excited (extra excited because we were tipsy) realising my brother was in the shower, meaning he was totally naked. She said, his just on the other side of the wall completely naked. We told he to be brave and walk in the bathroom, but also naked, then hop in with him. She said, As if I would. She's quite shy even flirting is hard for her. We suggested waiting in his bed. She said, ok, but only if we all go. My other friend Becky said, not naked, in our bras and undies. I won't go naked. Kelly looks at me and said, please come with us? Undressing as she asked. Followed by, you don't have to do anything because he's your brother, but just come. I was tipsy, a little silly, kinda curious, and wanted to help Kelly to finally get what she wanted. So I began getting my clothes off as well. Moments later we had all entered my brothers bed, then the bathroom door came open and he walked in with a towel under his arm. He was walking in slowly and was looking at his phone. His cock was half hard. Kelly was closest to him, Becky was in the middle and I was on the other side. Kelly said, Hi. In her most seductive voice. Wanna hop in? Lifting the blanket to expose he lack of clothing as she did. He froze for a second when he noticed we were all in his bed and he hopped in. Are you all mad? He asked. We'll suck it Kelly said, Yeah even your sister will said Becky. I'm jaw hit the ground when he said, Fuck yeah! Triple head! On your knees bitches! As he stood up. Now he was close to hard and I hopped onto my knees with the other two. My brother said move in close together. So we did, and he began slapping ou faces with his hot cock. I had a WTF moment and actually said, WTF am I doing? Everyone stopped and Kelly looked at me saying, please? I rolled my eyes at her and opened my mouth, putting my tongue out as I closed my eyes. Then my brother put his cock in my mouth and I began to suck it. Only about 20 seconds, then he moved to Kelly, then Becky, then back to me. He kept going from one to the next, and was getting faster. Within maybe 5 minutes he said I'm cumming, and deliberately covered each of our faces. I jumped up to use his towel on my face. Becky grabbed the other side of it to do the same. Kelly said, me next! I can't open my eyes! We passed her the towel and she began wiping her face as my brother layed down. Bye! Kelly said loudly from behind the towel. She wasn't saying it to my brother, she was saying it to us girls. We left closing the door behind us as we did. Becky was really tired and the alcohol was getting her. I just kept saying, did I I really just suck my brother off? She said, shut-up. We all did. She was soon asleep and about an hour later the sex sounds from my brothers room went quiet. I couldn't sleep, and don't even feel drunk any longer. My hair has my brother's dry cum in it. I'm in shock. I want a time machine so I can undo this mess. I will be fine with the girls tomorrow, but how am I going to face my brother? Why did I do this? I can't stop asking myself these questions of clarity now that it's done. FML.