Write an Erotic Short Story

Hi! I need a specific story premise written up as an erotic short story. I can pay up to $70 and it must be at least 20 pages and follow the plot. Make me an offer! Here's the title and plot: MY STRANGE STEPMOTHER Snotty nerdy teen boy named Bradley has father who marries a hippie woman in her early 30s with frizzy hair and huge heaving breasts. She is outgoing and has a wide smile and wears colorful clothes and has a fascination with strange pagan books and art. The boy is a selfish self centered teen and hates her even as he's obsessed with her giant succulent titties. The stepmother tries to be nice but Bradley won't have it. Bradley decides to cut her brake line to try and kill her. She gets in a wreck but is not seriously injured. The father goes on a business trip leaving the stepmother and son home together for a month. He suspects she suspects what he did she carries on like everything is normal. She makes Bradley a special dinner that tastes strange and wears a low cut top that makes him think about her huge plump natural heaving tits. Bradley jacks off in his bedroom that night thinking of her and magically shrinks to half his height (3 feet). He screams and she comes into his room in her panties and acts motherly and concerned about what happened to him picking him up and cradling his head in her breasts like a child. She keeps him home from school that week and they begin to bond and he fantasizes constantly about his now (comparatively) giantess stepmother and her huge curvy body. Especially since he can't jack off out of fear of shrinking further. She really starts to bond with him and even lets the tiny Bradley show her how to play his video games which turns him on even more and makes him think she's actually really cool. She finds his hentai collection and rather than be mad encourages him to watch hentai porn with her. They begin to make out and eventually they have sex and when he comes again he shrinks to 1.5 feet. Now that he's to tiny to even try to resist she admits to magically shrinking him and confronts the shrunken teen about the car accident. He runs under her naked meaty legs and tries to escape and she, worried he'll escape and tell on her, runs around the house trying to find him but can't. Pleased with himself Bradley figures he can keep hiding and wait her out and eventually find a way out of the house. She thinks for a moment and pulls out an old spell book. Sitting naked in a spell chalk circle in the living room she takes one of his Japanese porn mangas and begins reading it aloud. He begins to feel strange and insanely horny. Suddenly he feels his balls swell with cum but they can't hold it all and he begins to inflate with jizz like a water balloon tied to a spigot. He grows rounder and tighter and just before he thinks he'll explode she stops reading. She says, knowing he can hear her, she'll continue the spell and pop him like a little sperm balloon unless he stops hiding. Admitting defeat he rolls himself out from under the couch. Laughing she picks him up and plays with his bloated tiny body rubbing him on her curves and eventually stroking the tiny rotund teen to orgasm, draining the excess cum and shrinking him further to six inches tall. She demands to know whether it was him who cut the brake line. He refuses to admit so she rubs him across her nipples and belly and pussy and then blows him again which shrinks him to 3 inches. She puts on a tight bra that compresses her huge breasts together and wedges Bradley in her tight cleavage. She squeezes her tits together and he finally admits. Satisfied she shrinks him down to half an inch and shoves him up her pussy. When he thinks she's about to release him she has sex with the father and the shrunken Bradley is crushed by the fathers giant dick. Story ends with the father and the stepmother lying happy together with him sucking on her tits and her stroking his fat cock.