I'm imagining the boy is an orphan refugee who crossed the Mexico/US border illegally, and the woman is a single mom who owns the judo gym. The mom is charitable and gave the boy a free gym membership, and also has a teenage son who she forces to take judo classes. The boy gets good real quick and soon beats her son easily while she laughs at him for losing to a boy several years younger than him. The son then challenges her to take on the boy, saying he's too good.
The mom gladly accepts, saying there's no way a small boy can beat a trained grown woman like her. But then during their fight not only does he dominates her over and over, during one moment when his crotch gets pushed into her face, what she previously thought was a cup bulging out his crotch was much softer and squishier. And it is all recorded by the son and posted online to try to embarrass his mom.
The mom is shocked that she is turned on by what happened, and goes to her office to take a breather. While there she gets hornier and hornier, imagining that the boy actually has a huge cock and raping her with it. She gets so horny that she strips naked and fingers herself to a huge orgasm on her exercise ball.
The next day she is still super horny from what happened, so asks the boy to stay after the gym closes for a special one-on-one session. During their session they grapple again and the boy continues to dominate her, and she gets hornier and hornier as she keeps losing to him. She intentionally brushes against his crotch several times, and can't believe the huge bulge there could actually be his penis.
After they finish and are all hot and sweaty the boy says he's going to shower. The mom has a burning curiosity to see how big his dick really is so she follows him into the men's locker room and when he asks why she's there she lies and says that the rooms are gender-neutral. The boy is shy and hides his body with a towel as he strips and goes to into the communal shower. The mom strips naked too and follows him in. She takes a spot next to him and is disappointed he turns her back to her.
She grabs his shoulder and says she'll wash him for working so hard today, and washes his back, getting on her knees for his legs. Then she spins him around and is smacked in the face with by far the biggest cock she's ever seen in her life. "Oh my god your penis is huge!" she yells as he breathes heavily. Her mouth gaping, she grabs the shaft with one hand and it's so thick she can't even touch her fingers around it. She then pushes her elbow near the base and compares it to her forearm and it reaches all the way to her fucking palm.
She tells him she's going to clean his cock with her mouth, and licks all over the shaft before taking the head in her mouth. He cums super quick and she tells him to come back for another one-on-one session tomorrow.
The next day after everyone else leaves she meets him at the judo floor and tells him that grappling while naked is the traditional way judo is done, so she strips naked and tells him to strip too. He gets naked and they start grappling, and his cock gets rock hard as he pins her down on the mat.
![](https://i.imgur.com/r4b4Ziw.jpg)
When he straddles her face she starts sucking his cock. He gets so horny he straddles her face and starts fucking her throat hard, choking her. She can't push him away and cums hard from the throat rape.
For the next few days they keep fucking in their one-on-one sessions, and she decides she wants him to rape her anally. So she buys a few dildos of increasing size and trains her ass over the next week to prepare for his horse cock. On the day she wants it to happen she does an enema before their session, and purposefully lets him mount her on her hands and knees and fake begs him not to fuck her ass. By now he has become sexually dominant over her so he just slaps her ass and shoves his cock in her asshole. She screams as her ass is stretched wide open, but eventually has an anal orgasm.
She ends up adopting him, and they fuck every day and when her son finds out he tries to shoot the boy, but gets disarmed and subdued. The police arrest the son and send him to juvenile detention. While there he gets a Snapchat video from his mom, where the boy is holding the camera as he fucks her doggy-style. The son hangs himself right then while the video chat is going and when she sees her son just killed himself she orgasms, causing the boy to cum too, which ends up impregnating her.
They attend the son's funeral. Once it ends the mom and boy make out on top of his grave, then the boy takes out his cock and pisses on the grave for a full minute, after which the mom sucks his cock clean. They then run to the car so they can get home and fuck some more.