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Growing Anticipation

Date: 6/23/2017, Categories: Fetish, Mature, Taboo, Author: GmanDaveLXIX, Rating: 100, Source: xHamster

forward over the huge painting that hid everything in front of us. My mom called back, not being able to see us, "Yep, you guys good?" "Yeah," my s****r said. "Then of we go," my mom started the van and we hit the road. The first half hour was okay, we didn't say much since we were all kind of cramped, but at around 12:30 we hit a rough patch of road, and in all the bouncing my cock began to grow. I hadn't had time to be alone with mom since s*s got back, so I was already pretty agitated as is, but I still tried to f***e it down. Slowly but surly I could feel my head slipping out of my shorts and begin to rise up in between my s****rs legs. She didn't notice as she was watching out the window, but as it got taller she felt it touch her inner thigh. All I heard was her gasp loudly, but not so loud that the rumbling road didn't hide it from my mom. She quickly turned her head to me, "When did you get so big?" she whispered. I whispered back, "Well... you see, I'm on some pills like mom's. I'm so sorry, its just with the road and all..." I was interrupted by a pothole in the road. My s****r fell forward and as she did so, my cock shoved its way in between her breasts under the bikini. The added strain of the moment was too much, and the big button of the bikini popped off, flinging her bikini top back into my face. "Sorry," my mom yelled back. My s****r leaned back and as she did my cock stayed wedged in between her sweating breasts. "b*o, get it out!" she whispered in ... exasperation. I reached around her and pulled myself forward, out of her tits, but when I let go my shaft just swung back to rest on top on her breasts. "I can't make it stay back, sorry!!!" I whispered, but she just kept shifting her seat to see if she could find away to keep my cock away from her perky tits. Each time the head of my penis touched her tits, I could tell they were hard. This was exciting her. As she moved I noticed that she was grinding her pussy on the base of my shaft, until I saw sweat drip down her back. She turned again to face me, face bright red on her pale skin, "Okay," she breathed heavily, "Just stay still and it will go away," she said as if it were a fact but more with a voice of hope. She put her hands over her nipples to protect them from my cock, but this gave her no support against the bumping of the van. We hit one of those up and down wavy parts of the road and my s****r, unable to use her hands, closed her legs around my shaft to steady herself. I could fell the warmth of her pussy and could tell that it was very wet as she ground it into me. I was having trouble containing myself, I mean, fucking my mom is one thing, but both my mom and s****r? As the head of my cock rubbed the front of her breasts some more I made up my mind. My s****r's bikini bottom was one of those simple tie at the side things, and she had tied them in a simple, one knot bow on each end. During the whole ride I had kept my hands on her hips, just above the ties. Now, while she ...