Guy travels to alternate dimension to date stepsister

S

Strangebuddy

Guest
Guy's always had a crush on the girl next door. They of course never do more than hold hands and say they're dating when they're little, which their parents think is just cute. Time goes on and the boy is a savant, going to university at 13 while the girl he likes goes to high school. They still hang out when they can but they both get busy. Kid plows through his coursework and his projects get interest from people in high places. By the time he's 16, he's graduated and has made a good chunk of his doctorate program irrelevant due to the nature of his work.

Upon graduation, he sees the girl he's crushing on standing with his dad and her mom. She gives him a kiss on the cheek but something's clearly upsetting her. Turns out, her mom, a nefarious gold-digger, is pregnant with his dad's child and they're getting married. Boy doesn't know what to think and goes through the motions including the wedding. Girl moves in and the baby is born later. Stepmom is indeed very greedy and keeps pressuring her new stepson to let some of his project money take a walk into her bank account. What's more, she made sure her new husband adopted her daughter so she's legally the boy's sister.

Kids reach 18 and stepdaughter is about to enter her last year of high school while guy is working with global experts on a masterpiece. Guy starts getting media attention due to his young age and stepmom starts milking it. All the while, Guy starts seeing his stepsister sexually and finally confesses his feelings...only to be turned down. She says they're legally siblings and it would be illegal. What she doesn't say is that she doesn't want his project ruined if the media exposes them and she knows her mom would blackmail him if she found out.

Guy is distressed and decides to take his project for a test drive. It's of course a space-time conscious switching machine and he activates it. Suddenly he wakes up in a parallel world's version of his body. Maybe this time, he can meet the love of his (short) life under different circumstances.

For example:

Guy wakes up being pulled out of bed by his stepmother. She's yelling at him to stop stalling and go feed his sister. He of course knows nothing about what she's saying and plays dumb, already trying to figure out how he can get back to his old world. That is, until he gets deposited into his sister's room and she's wearing the skimpiest outfit he's ever seen. Sister protests, saying she can just eat later but her mom implores her that her brother's worthless for anything else so he can at least save her lunch money.

Sis pushes him down on the bed and apologizes, promising it won't take long. She pulls his pants off and kisses him. To her surprise, he springs right to attention and passionately kisses her back. She has sex with him right there and is amazed at how passionate he is. She gets up and gets dressed telling him he'll go to school with her today.

Guy gets dressed and then to his shock, he gets collared and leashed. Sis walks him to the bus where everyone aboard laughs at her "feeding" on her brother. She's mortified and heads to the back. Guy starts piecing things together as he sees the leashed guys holding purses and small lunches while the girls are all wearing nice clothes and have smartphones and other devices you'd normally see. Some homework he sees a girl doing gives him more info:

In this world, a severe dimorphism was caused by a gender specific mutation at the later half of the 20th century. Women became able to sustain themselves on sex and the life energy of males. Somehow, they managed to take over the earth and unite it under one banner. Men are now a servant class and provide sustenance to their mistresses.

Guy is shocked but reminds himself that this world isn't his home and besides, as his stepsister nuzzles him and asks if he meant it when he said he loved her during their love making and then whispers she's always loved him to, he thinks the world isn't too bad.

Things change at lunch though when he fails to heed a warning from his stepsister that he should resist as much as possible and take no joy from feeding his stepsister. He instead makes love to her passionately even as she begs him not to and suddenly feels hundreds of women tearing him away to try and feed on him.

He survives but becomes a hot commodity as the other women want to feed on a man that still has passion and lust. Stepsister refuses but stepmom wants to milk this for all it's worth and decides to set up an auction. Stepson tries to get away but his supposedly fragile stepmom tosses him across the room with barely any effort. She then pops out a whip-like tail and leather wings and tells him he'll need discipline. So yep, world of succubii

Another one could be a world where his stepsister is actually a supervillain but promises sex if he betrays the secrets of dimensional travel. She could of course conquer the multiverse...but she also wears thigh highs and and a tight leather outfit that shows off practically everything.

Or, fantasy. Good news, folks never got married and his crush is pledged to the guy...bad news: while he's a good guy, His body belongs to this world's evil lord and everyone wants to kill him. If he leaves though he'll let a force of raw evil back to this world.
 
Just a reminder: regardless of laws, step-kin-sex is not seen as incestuous by LIT Incest readers. First cousins barely qualify; I need to throw in blood siblings or parent-child to get decent readership.

You could try to make this work as SF with more emphasis on adventure than non-taboo sex. Or maybe in one alt.dimension step-sister Suzi becomes willing identical twins or triplets; cue the lez-incest MFF(F) action. In another alt.dim, Guy is identical twins or triplets who leave Suzi spit-roasted or airtight. In another, Guy has long forked tongue and cock to double her pleasure. In another, they are centaurs. Et cetera.
 
Arrgh, I know. Which is a shame since I think step siblings have interesting potential for stories.

Though flipping it could be fun. He wakes up in one dimension to find his crush curled up next to him in bed. He wakes her up and kisses her only for her to turn sick

...who punches him in the face. Turns out she's his full blooded sister in this dimension.

As long as the story starts with the guy not being able to have the girl he loves the story can work. By the end he might stick to his guns and get her, he might realize that first love is rarely ever final love, or he gets stuck in another dimension and has to live there.

One idea I had was a gender flipped world, where he finds he's engaged to his love...but even though his/her love is perfect in every way...he/she can't get past them being a guy...even though the possessed body is way more than up for it.
 
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