Adventure

You finish pulling on your shirt and open the door. Outside is Erin, your mother, who was clearly eavesdropping as you deflowered your twin sister. "How was it?" she asked, with baited breath, as you suspect she was jilling off as she listened to her children fuck. You grab her hand and confirm it with a lick. "It was great," you confirm, as you pull your mother in for an unmotherly kiss, which she easily reciprocates.

"I'm ready for Round 3," you say, dragging your mother with you towards the bathroom. Better to clean yourself off and fuck at the same time.

"Oh my," she said, as you lock the door for some privacy. "In here?"

You nod as you get in close. "I want to see everything."

You're not sure where this is coming from. Fucking Dana got you really hot-and-bothered. Erin smiled and backed off, giving a bit of a striptease as she exposed her large breasts, which you enjoy, but then slips down her blue silk panties to showcase her sopping vagina. The place where you originate. "Let's get you clean..." she says, biting her lip, before turning around.

You slip off your pants and come behind her, rubbing her surprisingly taut and large ass as she turns the water on. She doesn't move a muscle, except for her legs, which spread out slightly, opening her vagina for your use, if need be. You bend down and smell it, bending back up, and grabbing her sides. Her pussy is parted even more so as your erect cock slowly enters her, and you begin your second fuck of the morning.

The water is running, obscuring the sound as you thrust into her. She's holding onto the railing as you stop. "Let's get cleaned up, as we fuck around," you say, exiting her as she stands up a little disheveled.

"Whatever you say, son," she emphasizes your relationship, getting a thrill out of the idea of such, close, familial ****.

Four weeks ago:

"Phalarsenasthenia is no joke," says Doctor Roselle, the busty psychiatrist your parents had brought you in to treat your anxiety. The last few years, you had barely spoken a word in school, and only your family really ever heard you speak. It was getting worse and worse as you approached your eighteenth birthday and graduation.

"The three-hour disease?" asked Joe Donovan, your father, who recognized what sounded like a nonsensical word. "John doesn't have it. We'd know." He nodded in surety to his wife, who just looked horror-struck at the news.

"I didn't think so, too, but all the tell-tale signs are there," she started breaking confidentiality as she was remarking on what you told her in private. "He has incredibly intense incestuous thoughts on his sisters, his mother, other busty ladies at his school. Wet dreams every night and even throughout the day. He is masturbating frequently and several times a day. I even made him give me a sample last week."

You shrunk down further than you thought possible, remembering the session where she sent you into the bathroom to masturbate. To a naked photo of her, even. It was the weirdest session yet.

"I've confirmed with the lab results that he is a carrier of the strain," as your father visibly gasped and your mother looked over to you in pity. "These pills will help control his ejaculations in the next couple weeks, but I must insist that you begin having intercourse promptly with him after that," she looked directly at your mother when she spoke. "Perhaps the day of his eighteenth birthday. To avoid any legal entanglements."

Erin looked at her husband, who looked a little shocked. "You want my wife to fuck her own son?"

"I can't do that!" you shout, not really imagining all this happening, but your cock rose at the thought.

"It's perfectly normal," said Doctor Roselle. "In fact, with his attraction to Mrs. Donovan, almost a necessity. She doesn't have to enjoy it, just make sure that he does." They were talking like you weren't even in the room, as a pit formed in your stomach.

Your mother placed her hand on yours. "Don't worry, baby," she said, "I'll enjoy f... fucking you." She seemed to **** up, more at the idea of you having a deadly disease, than at the prospect of fucking her son.

"We need more than that, Mrs. Donovan," said the Doctor, coldly. "His twin sister is a frequent object of his fantasies. He'll need to fuck her. And his other sister, too. And several girls from his school, his homeroom teacher," she was looking at notes, "a coffee barista, his barber, myself..."

"Enough!" you spoke up, as she was referring to every sexual fantasy you have had. "I think they get the point."

"They will get your point," she said, licking her lips, as you looked over to your parents, who didn't seem to notice. "I've had trouble treating his anxiety, even with medication. We're going to have to wean him off of that before we begin fucking him. And we need to talk with these women, and get the word out, to expect frequent intercourse with John. Unlike other Phalarsenasthenians," she spoke that word with such practice and precision, "he's not going to be the instigator too much. He needs the object of his affection to come to him, so that he may ejaculate."

"All of his fantasies are very passive, submissive. I don't expect much domination on his part. Although maybe we can change that, in time," she wrote a very detailed, three-page prescription and presented it to your father.

And now you felt you were proving her wrong, as you finally fucked Erin as the warm shower cleaned your body. Dana was a treat, and Erin was even more delectable, as you slipped into her hole as you stood up, water pouring down your chest and onto her back as you fucked her. She moaned and groaned, and the whole morning's activities got you up to speed enough to finally ejaculate. Very little cum ran down the drain, as the majority of it lay within your mother, headed to parts unknown.

She cleaned you both up, as you put on a towel and exited. Dana was standing, still naked and covered in your cum, outside the door, as she smiled at you and your shared mother. "Stay clean, my love," she said, going inside to clean herself off. You walked hand in hand with your naked mother to your bedroom, and she kissed your neck.

"I'm going to see how your father's doing," she said, as she gently pushed you inside. "We'll be back at breakfast time. You have a busy day, young man," she pulled off your bath towel and slapped your ass, slamming the door shut as you stood in shock.

You put on a new pair of pajamas, your others being left in the bathroom to your embarrassment, and lie down. You pull out your cock and begin stroking, but to memories rather than fantasies. But that's not necessary. Cumming twice in such a short time, you feel very tired and, for the first time in a long time, fall asleep without jerking off first.

~6 AM:

Erin is standing over you as she gently nudges you awake. You notice she is wearing a tight, white shirt, and no bra underneath, to the point that you can make out her large areolae. You glance up to her face, and notice that she takes a quick glance to your exposed cock and then back to your face. "Breakfast is ready, baby. I think you'll find it quite enjoyable from now on."

She doesn't bother to close the door as she walks out