Every summer the Smyth family drove out to the forest and spent a month at the family trailer. It was nothing fancy, a queen size bed for Mom and Dad and a pull out couch for the kids Chris and Cecilia. Chris and Cecilia had out grown the couch years ago though and now shared a tent with a king size air mattress that was set up beside the trailer. The tent always got set up right outside the bedroom window of the trailer so the parents could yell at their rowdy children without getting out of bed. While at 19 and 21 Chris and Cecilia were no longer children the tent still got put on the same patch of dirt it always did.
Like many families while camping the Smyth's cooked over a fire pit and shared ghost stories over s'mores. Eventually the flames turned into coals and the coal began to burn out. Someone suggested it was bedtime so they put out the rest of the fire and retired to their various sleeping quarters.
Instead of sleeping bags Chris and Cecilia had put a sheet on the air mattress and had each brought their own blankets to use. They found it much more comfortable than being trapped inside a sleeping bag. Every night they would take turns changing and then fall asleep facing away from each other on opposite sides of the air mattress.
Soon, Cecilia was asleep but there was a weird noise keeping Chris up. He couldn't quite tell what it was at first. It was a sort of metallic creaking with moaning, mumbling noises. As he listened the noises grew louder and he knew what he was hearing. It was the rhythmic creaking of the trailer rocking while his parents had sex not 5 feet from where he was trying to sleep. He could hear his mother's moans as his father plowed away.
He knew it was wrong to listen and he should be grossed out but he wasn't. Instead he was aroused and soon his cock began to harden. As the rocking next door became more urgent and his mother's moans became louder all Chris wanted to do was stroke one out and climax when his mom did. He tried to be careful as he pulled his dick out of his pajama bottoms. He know any movement he made risked waking his sister. Soon he was slowly stroking his firm 7.5" penis. He quickly forgot himself though and began rubbing himself quickly shaking the air mattress. He heard his sister groaned and mumbled something having been jostled awake. Chris stopped and waited for his sister to resume sleeping so he could finish what he'd started. He heard his mother climax and was sad he had missed his moment but that wasn't going to stop him from cumming once it was safe. Unfortunately for Chris fatigue took over and he fell asleep, dick still out, while he waited for a safe chance to finish.
The temperature that night dropped down to 10C and Chris and Cecilia slowly moved towards each other in their sleep to keep warm. Eventually, they were spooning which was how Cecilia found herself when she woke her in the middle of the night.
Having been woken Cecilia noticed a couple of things. First was that she had to pee. Not badly though so she decided to try and hold it till morning, after it had started to warm up. Second was that not only was her younger brother spooning her he was sporting an impressive erection. She couldn't tell exactly how large it was but she could feel its firm length pressed against her ass. It gave her an idea.
See, while Chris had thought she had been sleeping Cecilia was also kept up by the sounds of their parents carnal actions. She had tried to ignore both them and the growing dampness between her legs. She had just begun to fall asleep when her perv of a brother began jerking off behind her. Jostling her fully awake again while she listened to her father bring her mother to completion.
She'd fallen asleep thinking about it and was sure her brother had to. Given her sleepy, horny brain Cecilia decided to have some fun with the young prick behind her. She slipped her bottoms off and pressed her ass firmly against her brothers cock and began grinding slowly. While she was grinding against her brothers cock she started rubbing her clit. She moaned softly enjoying herself immensely. Then she got her wish and felt her brothers hand firmly on her hip.
"What are you doing?!" he whispered.
"Giving you what you want you little perv," she said. "I know you were jerking off listening to Mom and Dad."
"Who's the perv now? Where did your pants go?" he sounded scared but had started thrusting back against Cecilia's firm ass. Her skin felt so warm and smooth and his cock had fully taken over at this point. He knew what they were doing was wrong but all he wanted was more.
Testing the waters he began running his hands all over her body. He caressed her curves and ran his fingers up and down her legs. She moaned in response encouraging him to keep going. He reached for her breasts and began playing with her nipples. He could feel precum dripping down his cock.
The whole tent smelt of sex and it spurred Chris on. He reached between his sister's legs and began rubbing her clit. It was more than Cecilia could take. She tended and arches back against him as her first orgasm washed over her.
"I need to be I side you" Chris begged.
Cecilia didn't say a word but opened her legs and reached for his cock to guide it inside her. Pure bliss ran through both of them as Chris's thick dick slid into Cecilia's tight pussy. He started thrusting himself deeper holding onto her hips to pull himself in. Each stroke pressed against her g-spot and he swiftly brought her to orgasm a second time. He could feel her hot cunt squeezing his dick over and over again as she road out her orgasm. Chris almost finished right then and there but held on. He couldn't risk filling her pussy with spunk.
