I recommend that you read chapter 1, 2 and 3 before delving into chapter 4, but here is a quick recap reminder of what happened. Eighteen year old Kevin Lansing came home to find his older sister Hannah licking his twin sister Kristen's hot pussy. He quickly stripped down and joined in on the filthy fun, where plenty of licking, sucking, tonguing and fucking took place. Later, their mother Krystal, a dominant mistress, and father Kevin, a submissive pet, came home and the fun continued. After some punishment was served to Hannah, Krystal devised a blowjob contest between the sisters. The losers of the contest were placed into a diabolical bondage for the evening in a room called 'the doghouse', while the winners are about to enjoy the delights of victory.
Chapter 4 - It's going to be a long night...
It was only a few minutes into Kevin and Kristen's night in the doghouse, when Kristen realized that she had made a bad mistake. As water from the enema bag flowed into her bowels, a new need suddenly made itself known. "Kevin?," she called out.
"What?"
"I can't see your face, where is it?"
"Same place as always, attached to the front of my head," he quipped wryly.
"No silly, I mean where about is your face? Are you right underneath my pussy?"
"Yeah sis, I can smell you, but I can't-" he stuck his tongue out as far as he could and tried to lift his head, but only managed to barely touch the fleshy part of her labia with maximum stress. "Ahh, I just can't reach you."
"But you're directly below me?"
"Yess," he hissed, starting to become annoyed with her questions. He was also struggling to resist the steady pump of the machine on his cock. The need to cum was starting to build already.
"I think we may have a problem," Kristen said in a low voice.
"What? Speak up, the machine is too loud."
"I said, I think we may have a problem," she repeated in a much louder voice.
"What problem?"
"I have to piss."
"What!?!" Kevin snapped, suddenly very anxious. "Why didn't you go after supper?"
"I went just before supper, and I didn't have to go when we finished. I didn't know that I was going to be suspended over your face Kevin. This stupid enema is filling my gut and putting so much pressure on my bladder, plus I drank two tall glasses of wine, and that's not helping."
"Well, you need to hold it sis. You can't pee now, you'll piss all over my face."
"I know, but I can't see how much more water is in the enema bag. It's still running into me though, and it doesn't feel like it's slowing down. There's no way I'm going to be able to hold it much longer."
"Shit!" Kevin cussed, then yelled, "Hey...Mom, Dad, Kristen's gotta piss!"
"They're not gonna hear you Kevin."
"I know," he grumbled, "Damn it Kris, I can't believe this."
"Hey, some people like to get pissed on. Maybe you'll like it too," Kristen reasoned.
Kevin sighed loudly. The machine had picked up speed and his orgasm was approaching faster than he wanted it to. For some unknown reason, the talk about him getting pissed on was somehow making him even hornier. Why, he didn't know, but he wasn't about to admit it.
Kristen held out for another few minutes. As the bag emptied the last of its contents down the hose and into her bowels, a new surprise awaited Kristen. "Unnahh oh shit, it's vibrating!"
"What's vibrating?"
"Ohhh ffuuck, the dildo in my ass just started buzzing away. I'm so fucking full, and now this thing is... oohhh sshhiittt, I'm cramping again. I'm gonna pee Kevin!"
"Kris, it's okay. I forgive-" Kevin began, but was interrupted by his sister's frantic wail.
"Ahhh I can't hold it anymore," she said, gritting her teeth as another cramp started, "I'm sorry Kevin."
Staring up into his twin sister's sexy bald pussy, Kevin saw the first few dribbles of yellow liquid leak out from her feminine folds and drip down onto his lips. The smell of her urine was strong, and he squinted his eyes as a larger squirt come out with more force. He licked his lips, tasting the stinging bitterness, and was surprised that it wasn't as bad as he thought it would be.
"Ahhhhh!" Kristen yelled as she finally gave out and released the flood.
The scalding hot spray blasted Kevin, and he closed his eyes tightly as his whole face was covered. Once Kristen started pissing, the relief was so great that she pushed forcefully to empty her bladder as quickly as possible. Kevin couldn't believe how much piss was spraying out of his sister and how fast it was coming out.
Then, to make matters worse, just when her spray got overwhelming, he started to cum.
"Mmmmhhh!" Kevin moaned, trying to turn his face away from the stinging hot spray, while his orgasm racked his body with spasms of pleasure. The sucking tube was relentless, still stroking at a high rate of speed because his semen hadn't reached the reservoir yet. His body moved of its own accord attempting to thrust his cock forward, but the straps held him tightly. His sisters piss stream weakened about the same time that his cock became super sensitive. Luckily, his semen reached the resevior and the sensors dialed down the suction, slowing the tube and, at least momentarily giving him some minor relief.
As the last few drops of pee dripped from Kristen's pussy onto Kevin's lips, he heard her low voice call, "Kevin?"
"Yeah?"
"You alright?"
"Yeah... How about you?"
"I don't have to pee anymore."
Kevin chuckled and nodded, "That's good." He felt his cock starting to shrink in the tube, but before it was flaccid enough to fall out, the suction picked up, and soon he was fully erect all over again.
---
Hannah lounged in the center of the king sized bed, waiting for her mother and father to join her. David had turned on the TV and Hannah was surprised when the screen came on to a view of her brother and sister in the doghouse.
"Oh wow, I never knew that you had cameras in there," she said, sitting up to watch.
"There's more than cameras, I have a few surprises in store."
Hannah was about to ask what he was talking about, when she heard her sister's voice from the TV calling "Kevin?". Kevin called back "What?". David turned the volume up and the two listened until they heard Kristen say, "I think we have a problem.". A moment later, Hannah gasped when Kristen said that she had to pee.
"Did you hear that? She's gotta piss." Hannah said as he father climbed onto the bed next to her.
From the bathroom doorway came Krystal saying, "Oh goodie, Kevin's going to get a taste of watersports." She rushed over to the far side of the bed and climbed on, sandwiching Hannah between her and her husband.
"You're going to let her pee on him?" Hannah exclaimed.
"Well if Kevin is anything like your father, he'll love getting pissed on. One time I made him be my urinal for an entire weekend. Every single time I had to piss, I made him lie on his back and I squatted over his mouth, and let 'er rip. He had to swallow it all, or take a beating. When I was done, he cleaned my pussy with his tongue. It's so nice to have a tongue clean your pussy after going pee."
"Are you serious? You like that dad?"
"I don't do it all the time, but I do enjoy water play occasionally."
"Wow...I never knew that."
On the screen they all heard Kristen say, "Oh shit, it's vibrating."
"Ha, she found the surprise." David said with a laugh. "The vibrator was set to turn on when the bag emptied. She's gonna have fun now."
"A vibrator in the ass is so fucking hot. I'll bet she hasn't had too many anal orgasms yet," Krystal said.
"Well she should have a few tonight," David added.
"You guys are so bad," Hannah said as Kristen yelled and started pissing.
"Thar she blows," David joked.
Hannah watched in fascination as the scene on the screen played out, and when Kevin started cumming, she felt herself flush with excitement. "He's cumming... I think he likes it," she whispered.
"Of course he likes it, he's just like your father," Krystal pointed out. "Now, do you want to watch them all night long, or do you want to collect your reward?"
"I want my reward," Hannah purred, the corners of her mouth curling up as her mother leaned in and kissed her on the lips. From the other side, David slid his hand up Hannah's thigh and watched the passionate make out session unfold before him. Krystal reached up and grabbed a handful of her daughters breast, while she pushed her tongue deep into her mouth. Both women began to moan as the heated kiss grew in intensity.
Feeling a bit left out, David started kissing Hannah's other tit. He sucked her nipple deep into his mouth and twirled his tongue around it until it became hard. Krystal broke the kiss and slid down to suck on Hannah's other nipple.