Your Son's Girlfriend

You head on over to your son's room, the door thoughtfully open. They haven't had time to do much more than set their stuff aside and take a seat, Tim on the bed and Karina at his desk facing him.

You know omnisciently that all they plan to do is hang out a bit and do some studying for an exam on Monday. And while that is great from a normal fatherly expectation stand point, it is rather less interesting from a perverted god's point of view.

You gaze at Karina in particular as you stand in the doorway, she wore a loose sweater and jeans on her petite body. She was plain but by no means ugly, her long luxurious black hair went almost down to her butt. Her big eyes behind her large glasses gave her a bit of a bug impression, but you had no doubt that little body was tight as fuck, the kind you could throw upon your dick with barely any burn in your biceps, a tribute to your son's discerning eye.

Still, that wouldn't do and with a thought the occupants of the room pulsed and shifted at your command. Tim is laid out on his bed, pants open and dick out, scraping against his girlfriend's bare abdomen as she writhed over him, her thick juicy ass looking delectable in the grey booty shorts she wore proudly emblazoned with word PINK. The roundness of her ass was epic, the saucy bottoms of it easily visible above the miracle of her now thick tanned luscious legs.

They're making out heavily, Tim's hand underneath that tank-top, squeezing a fat D-cup bereft of bra and of such exceptional firmness she doesn't need it. You did a fine job on'em.

She is squirming on top of him, as the hormones rage, as he begins to finger her. Karina pulls away, and goes down to his belt, unbuckling it.

You step right into the room and over to the bed, laying a knee on the bed you lay your hand upon Karina's lovely soft butt-flesh. She twists slightly, pulling back from Tim's mouth, giggling as her sexy eyes meet yours, her Asian beauty undeniable, voluptuous lips, gorgeous cheekbones, those nerd glasses gone in the most perfect expression of that 'She's All That' phenomenon.

"Hi, Mr. Evans!" she chirped with a high-pitched girly voice she hadn't quite managed before, her vibrantly blue hair cascading about her shoulders. Perfectly natural hue for a person of Asian descent now, they came in all the colors of the rainbow, their anime proclivities come to life.

"Hey Karina," you say, smirking as you stroke her butt.

"What are you doi-OOHHH!" she groans as you dip a finger into her slit, Tim continuing to suck on her taut white neck as the rest of her cute shirted form squirms and writhes about. "Mmmm yeah..."

Tim didn't say anything, looking resigned but unenthusiastic as he looked past his hot as fuck girlfriend.

"Hey Dad... sorry, I just-"

You chuckle and wave off his apology, "Relax. Believe it or not, I was a teenager once. You think I wanted to wait until Grandad showed me the ropes?"

Tim looked more than a but confused, they both did as you said something strange. You exert your will and reality changes. Tim's erection reverses growing completely soft as clear plastic appears around the base of both his shaft and his balls. As his penis shrinks, that plastic grows to wrap his diminutive member in a tight little bubble that holds it tightly against his balls, a thick slit at the tip allowing for him to urinate.

Neither of the teenagers find it strange that Tim is wearing a chastity device. Indeed, this is now a normal practice across the entire planet. It is now an accepted societal practice that parents control their sons' sexual expression until such time that they can fully pay for and support the birth of a child. Simply common sense, as otherwise young girls would find themselves beget with children left and right as irresponsible horny young men left them to raise their children by themselves. Not that this meant teen-aged couples were celibate. Far from it.

Naturally, a young man had a father who had a career that could support any babies out of wedlock (otherwise that adult would still have their penis locked up).

"Hey dad!" Now Tim is grinning, pretty excited as his gaze drops knowingly to your crotch. Karina is smiling too as she pushes off his chest to sit up and she twists around to look at you.

The moment is on pause and you can see they're waiting on you to take the lead as the responsible adult. You reach over to pat and squeeze her juicy butt, "Well, I'm not here to intrude on young love or youthful experimentation, whatever's going on here. I'm just supplying the tool to get the job done." You pat your bulge, "Just consider this Tim's and pretend I'm not even here, okay?"

You grab one of his pillows and situate it folded under your back as you lay down with your head propped on the wall and pull out your phone. You were content to relax and let things play out with your pelvis easily accessible once they're fun got to that point.

The two of them go back to making out, though now one of Carina's legs now plays atop your lap as she shamelessly grinds her wet snatch into her boyfriend's hip.

"Mmmm..." She moans softly, though you know she has to be getting off on this foreplay because her scent is thickening in the room. As you breathe in her delicious aroma, a small part of you smiles at how enthusiastic she seems compared to your daughter. At least she wants it enough to leave logic and reason by the wayside.

"Oh... you are so hard, Tim!" Carina comments, referring to your own bulging groin.

"Well, it is a part of our biology dear. Having a pretty girl in bed with us is sure to bring that out in any young man." You decide to intervene boorishly and 'dadsplain'.

Carina blushes a little as she continues to grind her hips into her boyfriend, your son, while bringing one hand down between them to rub at your bulge.

Tim groaned, "Daa-ad, we know how sex works, you don't need to educate us. Besides, I'm pretty sure Carina and I know more about it than you do!"

Karina tenses a bit and sits up a little, "Tim!" Then she looks back at you, "I'm sorry Mr. Evans, he didn't mean any offense." Her face is beat red now, but her hand never leaves your bulge.

"Oh of course not, don't worry about it!" You assure her even as you reach out and make your son want some oral relief.

Your curly-haired young dopple-ganger takes his Asian girlfriend's chin in his hand and turns her face towards his, "Maybe you can make it up to him for me. Would you be willing to blow me?"

Karina's eyes light up and she swiftly gets up and twists around to face you. Her dark brown eyes meet yours, a happy smirk twisting her lips, a look of lusty interest it would seem. She turns back to Tim and kisses him, "Yes!"

She loves the idea it would seem.

Tim makes out with the girl for a few moments while her tiny hand seems to go into overdrive, gripping your cock firmly through your pants and rubbing it vigorously. They finally break apart and she is soon bent over your lap attacking your zipper and soon gripping the hem of your pants, jerking them down your hips haphazardly. Soon enough her small fingers are curling around your epic-ally erect penis (you'd tripled your former size on a whim and now the monster towered out from between your legs).

Carina's eyes were wide as she practically screamed, " "Ohmygod! Your cock is HUGE! Like it's SO big! Wow!"

"Thanks, I try..." You joke modestly, though you're instantly too busy enjoying a fresh pair of lips on your tip to pay much attention to your words.

The kinky teen is soon working herself down over your lap and taking more and more of you in her little mouth. Though honestly, you're so now so big that she can only just barely fit the head past her lips. It must be quite a sight though for Tim who is sitting behind her on the bed watching with awe in his eyes.