Release
Brad fucked his sister anonymously again, in the dark on the boulder by the lake, just like the previous night. Lisa was right, he did last a lot longer. He listened to Cassie scream, and felt her squirming beneath him for what seemed like hours, though he knew it couldn't have been nearly that long. He wantonly sawed in and out of her delightfully tight, wet slit.
She excited him so much that he stayed hard even after he'd come, with her wet cunt embracing his faceless, nameless cock. He just kept pounding into her, relishing the sounds of her screams, and the thought that he was bringing her this much pleasure. The only way he could deal with his sense of raping his baby sister was to give her as many orgasms as he could.
So he fucked her long and hard, long after he was exhausted and numb. Once he had come himself, it was all for her.
He did it again the next night. And the night after.
By the fifth time, Brad had mostly shed his inhibitions. He wasn't entirely without guilt, but he grew more eager each night. He'd grown almost comfortable with the arrangement. Lisa enjoyed it. He enjoyed it. Cassie seemed to enjoy it the most.
She was the ignorant victim in their sordid masquerade, but she liked it. If she never found out that it was her brother that was mounting her and driving her to orgasm each night, then the whole thing was ultimately harmless. He just had to protect his identity.
The fifth night was different.
Lisa's parents had gone out for the evening. They were going to dinner with friends in another town, over an hour's drive away. That meant the house was all Lisa's until at least midnight.
Brad and Cassie and their family were just finishing dinner. His two older sisters had taken a break from work and had driven up to join them for a few weeks. They immediately talked about heading out to a nearby town to go to a bar, as if they'd been there all summer and were as bored with the social life as Cassie and Brad.
Cassie and Brad both refused the offer to join them. Brad felt awkward. He knew that Cassie had a good reason, but he should have been jumping at the chance to get out, to drink, and to meet women. It looked strange when he said he didn't want to go. As an excuse, he claimed he'd lost his fake ID.
As soon as he said it, he looked shamefully at his feet, thinking about how he'd really rather stay home so he could fuck his sister.
Aimee and Tara had left for the bar just before Lisa arrived. Lisa chatted with their parents, just polite small talk designed to make them think she was a good, well sorted out college girl. They talked about her plans for senior year, and after college. Then Lisa lead their youngest daughter Cassie out into the evening sunlight, to take her home for an evening of wild, shameless lesbian sex, and something far more wicked.
Brad waited as long as he could before following them, more than an hour. He walked down the road as the sun was setting. Soon he was standing outside of the house Lisa's family rented, set back in the woods, far from the road at the end of a winding, gravel driveway.
Lisa had left the doors unlocked. The heavy, deep green front door was ajar. He quietly pulled open the screen door, eased it closed behind him, and then softly climbed the carpeted stairs. He could hear giggling and moaning coming from Lisa's room.
Once outside the door to her bedroom, a quick peek around the corner showed him that Lisa lay beneath Cassie, their heads between between each other's legs. Cassie was holding her head up, well above Lisa's lonely pussy. She thankfully faced away from him toward the dark oak headboard. Her pretty ass was aimed right at Brad, just like on the boulder all the other nights, but more clearly visible in the flat and fading evening light.
Lisa had her own face buried in Cassie's pussy. She was making assorted loud, silly noises, eliciting peals of laughter from Cassie, interrupted by the occasional moan or sharp intake of breath as Lisa abandoned her comedy routine and instead found a sweet spot to which Cassie responded charmingly.
Brad backed off and leaned against the wall. He listened for a long time, until their giddiness subsided and their lovemaking turning more serious. Cassie began to moan and squeal as Lisa began her own, usual, filthy monologue.
"Are you ready for your cock to come again, Cassie? Are you ready to be fucked?" Lisa asked wickedly.
All Cassie could manage by now was a single high pitched "uh-huh" sound. Even that barely coherent response took a visible effort from her.
"He's going to fuck you really hard today, Cassie. This isn't a boulder, it's a nice soft mattress, so he can ram his cock into you as hard as he wants to," Lisa warned. "And I know he wants to. Really, really hard."
Brad noticed that Lisa had dropped all pretense of the cock being hers. It was some faceless guy's cock, now, not her own fantasy cock.
