My Brother Cheated on His Girlfriend

There was still some stuff my brother had to get from the house to move into his apartment where he is living with his girlfriend. So, he came over on this last Saturday morning to get some of that stuff. My girlfriend was over for the weekend, so naturally, she and I are already naked about the house. Dad was working on a project in the garage. Mom was topless enjoying a book out by the pool. 

My gf and I were between sexual sessions with each other and just relaxing naked on the couch watching a movie, being a bit too hot to be outside for our tastes, the a/c was optimal.

My brother was done packing up the rest of his stuff and decided to enjoy the a/c himself, so he then stripped naked and sat on the couch with us on the other side of my gf. He said, "Well, I'm officially moved out." I high fived him over my gf. My gf then asked him, "Can I get a feel of your cock before you go?" I burst out laughing. She's like "What?" I teased her, "Keep it in your pants; he's got a girlfriend he's quite committed to. He can't be goofy around over here anymore."

He stood up in front of us and said, "How about this, one last mutual touch with everyone before I go. Do you think that'd be okay?" He looked at me for confirmation. I looked at his pretty well hung dick right in front of me as I thought about it. My hand went to my nipple, and then lust made the decision for me. I said, "I see no harm in that." With that, he walked out to the back deck where mom was sitting topless. My gf and I watched from inside as we saw my mom fondle his hung dick, causing it to swell a bit but not be fully hard. Then mom stood up and gave him a big hug. My gf went "awww" and I thought it was a sweet moment, too. I saw a chapter in our deviant behavior closing.

He headed back in and I asked my girlfriend to go wait in my bedroom so my brother and I could have a moment. I waited for him in the kitchen, naked, and propped myself up on the kitchen counter. I said, "Hey, where it all started, huh?" He came up to me and felt my boobs, lightly caressing and massaging them, fingers dancing over my nipples. I reached down and felt his semi hard cock. I started to massage it and feel his erection build in my hand. He put himself closer to me, so I positioned his cock upward against my smooth pubic region (I am currently completely shaved). He plays with my boobs as I let him grind his erection against me, then, he put his hand down there and pushed it in. I stopped him ... "No, we're not doing that. Take it out." And he pulled it out. He rubbed himself for a bit as I hopped off the counter. I then grabbed his erection and at the same time, open the junk drawer in our kitchen and pulled out a condom. I said, "Listen to me. Our interactions are done, but since we're counting this as big send-off for you, there's a gift waiting for you in my bedroom cause she wants to play with it. If you choose to do more, using this is a must..." I hand him the condom and then go sit on the couch.

He walks to me on the couch, gives my boobs one last feel, then goes back to my bedroom, condom in hand. (Yes, my gf and I had talked about this prior.) I heard my bedroom door close, and for the next hour, there were sexual noises on and off, incoherent talking, and some giggles. Then my brother came out, with a hanging spent dick, got dressed, said goodbye and left.

I then went to my bedroom to cuddle and well, do more things with my gf and talk through what just happened.