It Runs in the Family (piss)

Aidan woke up groggy on the second day at his grandparents with a raging hardon and nearly aching balls. The clock showed 11:00am, far later than he'd have been allowed to sleep at home. Most days, his mom would have woken him up with a blowjob or sex by 9:00, then **** him to get out of bed before the afterglow had even faded, whether or not he had anywhere to be or anything to do. All part of being a diligent parent, she said.

On the one hand he'd love to sleep more, on the other his bladder was absolutely at its limit. He rolled out of bed and made for the bathroom. His room was adjacent to his grandparents' at the end of the hall. Through the open door he could see his mother on top of his grandfather. She was leaning down exchanging long kisses with the old man as her hips worked slowly back and forth pumping his girthy cock in and out of her pussy. Aidan could see her free-flowing juices dripping off of his grandfather's low-hanging balls. A dark wet spot below indicated that this had been going on for some time. The affection they shared was palpable in the air. He'd known his whole life that his mother was a shameless daddy's girl, but it was still touching to see them in action together. Her pink asshole clenched briefly as grandfather squeezed and stretched her ass cheeks apart, and Aidan had to fight the urge to jump on the bed and shove his morning wood directly into her back door.

Instead, he turned for the bathroom down the hall. Passing the other guest room, where his sister was staying, the door was open and the room empty. Dad must have gotten her up earlier, he assumed. The bathroom was at the end, next to the main living room at the front of the ranch-style house. Entering, he saw that the sink basin was still full of the toys that the family had used last night. Two dildos, one pink one brought by his family, in average male proportions, one black in **** porn star size that his grandmother usually kept on the coffee table; two butt plugs, his father's golf-ball sized one unadorned in stainless steel and his mother's hole-through clear silicone. He smiled as he remembered all the family men jerking off together into a funnel placed into that hole the night before. There was also an anal bead wand and the usual couple of vibrators. All of it covered in the stickiness of dried lube and bodily fluids.

The display and the memories it conjured up were not going to help his purpose, unfortunately. Aidan sat down on the toilet to try and **** some piss through his rock-hard cock. Holding his member pointed down into the bowl, he closed his eyes, took deep breaths, and tried to relax every part of his body to bring his piss sphincter along for the ride. Finally, he was able to get a stream going, to his immense relief. After several seconds of ramping up his flow from "leaky valve" to "raging river", his grandmother popped her naked upper body around the doorframe.

"I thought I heard someone up and about!" she said brightly as Aidan met her eyes. Then she spotted his hand holding his erection pointing down and her eyes flashed a hungry look. She quickly moved over in front of him, knocked his hand away and pulled his still-pissing cock up out of the bowl, spraying piss onto the floor and herself. She immediately sat down straddling him, shoving his cock into her cunt.

"Keep peeing, sweetie!" she cooed at him urgently, stroking his face and shoulders. "Stay relaxed!"

Aiden could feel his grandmother's vagina fill with his urine. The pressure was forcing her walls away from his cock as she was stretched in every direction at once by the fluid. She seemed to be clamping down as hard as she could on the base of him to prevent it from draining out immediately.

"Mmmmmmm," she let out a long soft moan with her head thrown back, eyes closed. "Your grandfather and I haven't done this in months."

After perhaps 5 seconds, the pressure in Aidan's bladder seemed to equalize with the birth canal wrapped around his prick and his flow stopped. He could barely feel her cunt gently brushing against his penis now and then. It was a marvel that his elderly grandmother had the incredible kegel strength to hold this all in, though he could feel a steady dripping off his balls. She was sitting, arched back frozen, hands on his shoulders, completely rapt with the sensation of a fully stretched pussy.

Aidan took the opportunity to admire what he could see of his grandmother's body from this position. She had been a busty woman in her youth. The large, firm teardrops of forty years ago that Aidan had seen in family photo albums now sagged heavily toward her lower ribs. Her pink nipples had enlarged to the size of gumdrops and faded in color a bit. She still looked absolutely fantastic though, with soft smooth skin barely touched by age blemishes. He lifted one dangling tit to his mouth and started suckling on the large candy of her nipple, causing another small moan to escape her parted lips.

"Mmm, OK, ready?" she asked, pulling her head back down to look at him shoving her breast into his mouth.

Aidan just made a curious noise at her, not knowing what she was referring to. Then she let go of her internal vice grip on the base of his prick. A huge rush of his own pee flooded over his balls and into the toilet. At the release of the backup pressure he was able to finish emptying his bladder against her cervix with a little squeezing of his own. This teased a ticklish giggle out of her.

"Are you all done?" she asked when he'd been spent for a several seconds. He indicated he was.

"My turn, then." She lifted herself up a bit up, taking the pressure off of her urethra and suddenly his cock was covered in flowing wetness again. Though now it mostly flowed down over the bottom few inches of his shaft and then ran around and below him. He could feel his grandmother's pee flow along his taint and fall off his butt cheeks. He tried thrusting up into her, making her flow stutter and splash as he bumped up against her pisshole. Sadly, it was over too fast, her not having just woken up with a full bladder. He kept thrusting as they drip-drained. With the need to urinate gone, his balls were demanding their own release louder than ever and he went at his grandmother's wet cunt with increasing gusto, frustrated by the position limiting his motion to an inch or two.

After a minute she gingerly lifted off of him, briefly giving him a great view of her thick white forest atop hairless lips. She had long, dangling purple-brown inner labia that made his mouth water. She turned towards the bathtub before he could lean in to suck them into his mouth.

"Fuck me in the shower, sweetheart, so we can clean up after," she said, stepping into the basin.

"That was awesome, Grandma," Aidan said, getting up and joining her. "I've never gotten to do that before."

"Oh, really? Your mother loves that one, I'm surprised she hasn't shared that with you." She turns and bends over, grabbing the handy safety railings on the walls of the shower area. Her legs spread, her grandson admires the ever-so-slightly mottled skin still tight on her back and firm ass.

Aiden guides his prick back between those hanging purple lips into his grandmother's gaping fuck tunnel. "I know she likes pee-play a lot... but mostly it's something she and dad do."

"Well now you know where she gets it from, darling." Grandmother presses her ass hard back against her grandson's cock. "If you had fun, you should let her know you're into it, maybe she just isn't sure."

"I'm definitely into it!" Aiden says, happily slamming in and out of his grandmother's piss-lubricated cunt, shaking drops of her juices free of his swinging balls.

"Well then I guess we know where you get it from too, dear!"