I was with my girlfriend and her sister. We slent the day hanging out and shopping at an outside mall complex. Her sister was staying the night. I let them have the evening out in the living room while I watched some TV from the bedroom.
I got up to refill my water cup at around 11pm and when I walked through the living room, only her sister was awake still. My girlfriend was passed out on the couch. I probably should've had more clothes on than my sleep shorts. You could definitely see my dick print and her sister was looking at me the moment I walked in.
I guess its my house, and if I want to walk around shirtless, I can. Her sister walked over and started talking to me. I watched her eyes going all over my body. Who doesn't like a big strong man though? Haha
"God I wish my boyfriend had a body like yours." She said.
I was flattered, but needed to make a joke. "Well, thank you, too bad big muscles mean I have a small dick?" I said and laughed.
She didn't laugh. "I know thats a lie." She said looking at my crotch. "You know my sister and I we tell each other everything."
I was kind of feeling awkward. Of course my girlfriend's sister is really hot. She had a bigger tits, and all I could do is think about her beautiful eyes looking at me and big lips wrapped around my cock. I needed to head back to the bedroom. "Oh interesting. We'll im gonna go back to watching my show." I told her. "The guest bedroom is ready for you too when your ready."
I walked away and she stopped me saying, "My boyfriend's dick is 5 inches and not even close to as thick as yours."
I turned around. "She really does tell you everything." I kept walking and shut the bedroom door.
A half hour passed and my girlfriend came to bed. We laid down and I asked her, "hey umm, did you tell your sister I have a big dick or something?"
Without hesitation, she said "oh yeah. She didn't think any white guys were bigger than average. So I told her you were 7 inches and as thick as her wrist!"
"Oh." I replied. "So, maybe dont do that please? I got up to get water and she was staring at my dick the entire time."
"Well. No. I'm not going to do that. She told me how small her boyfriend is first. So I had to compare!"
"Okay." I said and got up to use the restroom.
I passed the guest room in the way and I could hear her sister moaning. It was hot. She was really having a fun time. I could feel my dick growing. Thats when my girlfriend opened the bedroom door and saw me listening. I froze in place. She walked over and whispered in my ear. "Let's help her out." She flew open the door.
There was her sister, fingers deep in her pussy. She didnt even flinch and kept going. "Let's share sister!" My girlfriend said as she pulled down my pants.
My cock flung up and her sister gasps. "Oh my god! She said. "Your boyfriend has a huge dick!"
Her sister crawled her way over to the edge of the bed and started jerking me off without hesitation. My girlfriend watched. Then she joined in so both their hands were stroking my shaft.
After that, we did it all. Blowjobs first as they switched back and forth taking turns. Then they had my lay on the bed while the jumped back and forth on and off my cock. Sister bonding time I guess!
When it was time for the big finale, her sister got my load of cum all over her big tits. She loved it. She was so happy. Both if them were. I felt like a king. We all went to bed together and in the morning she went home. They joked about doing it all again next weekend! They even laughed about including their mom!
All I can say is, I guess being a slut runs in the family!