They had a well outside of the house which they used to draw water. Beth had drank from it several times, so it was no surprise when she felt the urge to pee. The house also had an outhouse nearby so they weren’t entirely without amenities.
    She excused herself from her family as she went to go use it. If anything she wanted an excuse to get away from her sister. Mary was positively glowing as she always moved around the room to be next to Dan.
    Her hands couldn’t stay off herself as she kept feeling her slightly swollen belly.
    Beth felt her own as she sat down at the privy. The swelling had reduced overtime. She didn’t know the technical details, but it seemed her body was slowly absorbing the semen somehow or another.
    As she removed her pants the small pressure caused a slipping feeling, she knew it wasn’t being absorbed fast enough. The block that Dan had ejaculated into her didn’t seem to be that durable. Throughout the day she had felt it steadily weaken.
    At the moment it would only need a small amount of pressure to finish breaking and then the remaining fluids would come spilling out her. She had resisted the urge thus far as she had enjoyed the feeling of being full and her mind kept lustfully imagining the sperm surrounding her eggs as they oozed into her deepest parts.
    With her husband getting pregnant was just to have children that she could raise. It had been an entirely logical decision that they had made together. This was different. Her body rather than her mind had decided it wanted another child. While her mind was hesitating her body was proving to be quite persuasive.
    Sitting down on the privy she moved her hand down between her legs. She of course had to pee, but there was another reason she had wanted the privacy.
    Mary had drank the majority of the semen that morning so the aphrodisiac effect was stronger for her, but Beth had had consumed some as well, even if it was a smaller dosage. Her mind again felt a deep jealousy towards her sister.
    When they had returned and it was visible Mary had been pumped full of a massive load of cum, Beth had caught her breath. She wanted to scream and cry at the same time. Her body had already been aching for attention and seeing it given to someone else ignited an intense rivalry inside of her.
    Each time Dan would shift position in the room Mary would follow, and Beth was forced to trail behind as they sat closely on either side of him like lions eyeing their prey. The only thing that had stopped it from progressing into an outright conflict was the presence of Mia.
    The three of them had decided to keep her in the dark about the situation. Dan was younger than her, but it wasn’t preventable for him to not know as it centered around him. At the very least she wanted to keep her daughter innocent.
    Her hand on her pussy started to move. She felt some level of urgency as she started fingering herself. The longer she was gone the more Mary would sink her claws into her son. She hadn’t wanted to leave, but the arousal was too distracting. If she didn’t relieve it at least a little then she was going to lose control.
    She moaned a little as her movement intensified. She hadn’t been a dirty girl during her life. It was always her older sister that was pushing the boundaries and doing lewd things like buying sex toys. Beth had tried to be innocent and pure, but recent events had drastically changed her.
    Her body pulsed as she used both hands. One hand was sinking inside of her feeling the internals and the other was rubbing her clitoris. She hadn’t realized how sensitive it was until Dan had began fiercely rubbing it during the night.
    She wasn’t prone to touching herself and her husband had only simply inserted himself. As a result Dan had opened a whole new world of pleasure to her.
    She leaned back against the wall of the outhouse, her moaning intensifying as the slick flesh made a clicking sound in time with her movement. She moved faster and faster, the friction was heating up her body at the same rate as her growing arousal was. As a result her pussy felt burning hot.
    Her vagina gave a hard twitch as she started to orgasm, her fingers didn’t stop as fluid started to spray out. The rolling twitching caused her to convulse internally. Leaning back she gave a throaty moan as she gave into it.
    The inner movement caused a shift and she felt the seal Dan had implanted in her slip loose. Immediately the pressurized fluids in her started gushing out of the hole. She gasped as it intensified the orgasm.
    Her belly quickly returned to normal size as the cum sprayed out of her and into the toilet below. Her hands were covered with the sticky solution even as she shoved them deeper inside of herself.
    Slowly the orgasm faded and she was left feeling the remaining fluid steadily drip out of her. She relaxed sprawled on the toilet as she basked in the afterglow. Her relaxed body took the opportunity as her bladder also relaxed.
    Hot pee sprayed out of her as it gave her a small and steady stimulation. She trembled as her legs shook side to side. Eventually that too stopped and she was left feeling entirely spent. The first thing on her mind though was that as good as it had felt it felt far better with Dan.
    The door suddenly swung open and her heart jumped into her throat as she was sitting legs spread with pee and semen dripping from herself.
    In front of her entered her sister. Mary smiled as she said “I figured I’d find you like this.”
    Beth’s gaze darkened as the enemy appeared, closing her legs defensively she said “What the hell do you want? Aren’t you busy seducing my son?”
    Mary stepped into the small outhouse closing the door behind her. She was still smiling as she said “You always were so possessive and protective.”
    Beth snorted “You were the one who always stole my boyfriends! You didn’t even like them! You just seduced them and then dumped them until I had no one left!”
    Mary shrugged “They were all pigs anyway. I didn’t grab your husband, because I had thought he was too boring for even you to fall in love with.”
    Beth stared at her open mouthed.
    Mary laughed “Joking of course. He was adorable and I’m sure you were very happy together. Your union at least gave us some good things…”
    Beth’s pants were still down and she felt vulnerable. Trying to cover herself she questioned “What do you want?”
    Mary looked around the small room and started unbuckling her pants. Beth stared at her in shocked confusion and a second later Mary’s pants were entirely off and were followed by her shirt a second later. Her large breasts were in full view as she wasn’t wearing a bra prior.
    Shrinking away from her sister Beth questioned “What… what are you doing?”
    Mary pulled off her panties showing off her smooth pussy below her swollen belly. She smiled as she said “I just wanted to make it clear that we’re sisters first. I don’t want you to hate me for taking Dan’s attention. He’s plenty big enough for the two of us.” She took a short step forward “If you’re still unsatisfied I can help you out a little.”
    With that her leg moved to Beth’s side and Beth gasped as her sister suddenly straddled her. Their pussies were only a few inches apart now.
    Mary pushed her head down as she locked lips with her sister.
    Beth was shocked by the turn of events and helplessly overpowered by her sister.
    With their lips together Mary’s hands grasped the sides of Beth’s head as she pulled her deeper into the kiss.
    Beth panicked as her sister’s tongue slid into her mouth, but her resistance was feeble. Her body was aroused from her own masturbation, so although the situation made her uncomfortable it was also turning her on. In the back of her mind she thought, you’ve already fucked your son this hardly compares.
    With that thought her own arms wrapped around Mary. They dragged along her back and transitioned to the front. She brought them up and wrapped them around her sister’s breasts.
    Her own pussy twitched at the contact. She wouldn’t admit, but she had always been jealous of her sister’s rack. She hadn’t ever gotten a chance to feel it in depth though, now that the opportunity was upon her she wasn’t wasting a moment.
    Her hands roughly grasped them as they squoze the fatty tissue. They pinched the nipples and played around.
    Her sister and her were both gasping in between intermittent kisses. Their faces separated and conjoined as their lips roughly entwined. Both of their tongues stretched out and entangled each other. The slick flesh danced around.
    Mary’s hands shifted down and were doing their own inspection of her Beth’s tits.
    The two of them were gasping and with her tits being played with Beth desperately wanted to be touched at her more sensitive location.
    Hoping her sister would get the hint he stretched her right hand back and behind Mary’s ass and brought it between her legs. Her hand slid past Mary’s anus which trembled under the passage, it was only a little further when she felt the hot smooth slit and started sliding her hand along its length.
    Thankfully Mary didn’t let her down as her right hand slipped off Beth’s breast and slipped down lower. Mary demonstrated practiced ease as her ring and middle fingers slid into Beth’s slit. Her thumb slid up and started vibrating on her sister’s clitoris.
    Beth tried to keep up as she pushed against the fingers penetrating her. Her own right hand slid further and she hooked her thumb inside of Mary. Rather than trying to push it in deeper she kept it hooked as it pulled down the sensitive flesh from inside.
    The rest of her fingers stretched further and started petting her sister’s hard bump.
    The two of them were moaning. Their saliva was thoroughly mixed now and both their hearts were beating wildly.
    Mary suddenly pulled away and Beth was left gasping as their hands pulled out of each other. Beth pleaded “Don’t stop!”
    Mary smiled licking up some saliva that had begun sliding down her cheek. She eyed the small outhouse before saying “Hold my legs for a minute.”
    Beth was confused, but Mary ignored her as she kneeled down and pointed her ass towards Beth. Beth looked at the swollen vulva as it slid closer to her. Mary lifted herself with her strong arms and Beth reflexively caught her legs as they pushed onto her.
    They shifted slowly and it ended up with Beth laying down on the long seat of the toilet and Mary laying on top of her. Mary’s dripping pussy hung above Beth’s face. Without any further comment Mary sunk her face into Beth’s pussy.
    Beth’s legs stretched forward as she felt the tongue enter inside her and start swirling around. She didn’t resist as a pussy lowered onto her own face and she started reflexively sucking on it.
    She had no idea what she was doing, but she emulated whatever Mary was doing to her as best she could. Her tongue slid in tasting the powerful fluids and she started slurping in as more was produced. Her tongue spiralled as she experimented.
    Her own body started contracting as she orgasmed under her sister’s efforts. She felt fluids pulsing out only to be licked up as they were produced.
    Mary under the effect of being eaten out and drinking orgasmic fluids likewise began to cum. Beth felt a wave of liquid hit her and she licked it down. Without thinking she reached her hands up and shoved them against Mary’s swollen stomach.
    Mary moaned loudly as the barricade broke within her. Dan’s stored cum began spilling out and Beth was in position to receive it as it began spraying into her mouth.
    She gulped repeatedly as it rolled down her face, the taste was a little different than Dan’s. It was of course mixed with Mary’s own vaginal fluids, the result was something akin to an aged wine.
    She couldn’t resist as her tongue slid in basking in the flow of sticky liquid. She was holding her breath and desperately needed to breath, but she couldn’t risk missing this chance. The hot liquid ran down her throat.
    Her arms gripped Mary’s body as her sister trembled in a prolonged orgasmic bliss. Slowly it calmed and the two women kept swirling their tongues inside of one another for a long time as their bodies gradually relaxed.
    Eventually Mary pulled away and Beth gave her vaginal lips a final playful lick. Mary laughed slightly as she ran a hand along her sister and licked the result. The two of them laughed as the barrier between them broke.
    Mary smiled “See if we can do this then there’s no reason we can’t share Dan. If we find a way to occupy Mia we might even be able to do something at the same time…”
    Beth blushed as she imagined a threesome with her son and sister.
    She shook her head though as she looked around at their disheveled state. Both of their bodies were wet and sticky with each other’s fluids. Their hair and clothes were likewise a mess.
    Speaking she said “We have to clean up, we’ve been out here for a while…”
    Mary nodded, but she took a step forward and her mouth began sliding over Beth’s body licking up her own spilled fluids. She sucked on one of Beth’s tits for a moment before Beth shoved her off laughing. “We really have to stop! One of them could come out here to use the outhouse any minute now.”
    Mary shrugged as they both pulled up their pants. At Mary’s insistence they both exited the outhouse topless. It was dark outside as the two ran to the well giggling. Pulling the bucket up they used the cool water to rinse themselves off for the most part before helping each other pull on the rest of their clothing.
    With a final check they headed back to the house. As they opened the door they found it empty inside. Read more »