[T4B] Your Sisters Boyfriend

I am 18+ and all characters and participants must be 18+.

The premise of my idea is pretty simple and I’m looking for a partner who is capable of adding to the plot and bringing their own ideas. Before I get to the idea, my requirements in a partner are below:

• Must be 18+, 20+ is preferred

• I’m looking for partners who can match my writing style and length. I write exclusively on Discord, in private servers. I only use third person POV and expect the same of my partner. I can write between 300–800 words and you should be able to write around that same amount. It doesn’t have to be an entire novel, but I ask that it is grammatically correct and effort is matched.

• I’m looking for a long term roleplay, usually able to respond at least once a day, if not every other day. I’m very flexible and will always understand real life comes first, I ask the same of you.

• Have a writing sample prepared. I’ll probably ask for one to make sure we’re compatible, and I’ll have one as well.

• Be open to OOC chat! I enjoy getting to know my partners and going back and forth to come up with ideas for our story. Communication makes everything so much easier and more fun.

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MC has been dating YC’s older sister for several years.

At this point, he’s practically part of the family. He’s at every birthday dinner, every holiday gathering, every summer barbecue. He helps move furniture, gets dragged into family game nights, and knows where everything is in the house without having to ask. Everyone assumes he’s the dependable boyfriend who’s eventually going to marry into the family.

Including YC.

For years, they’ve existed comfortably in each other’s orbit. Trading sarcastic comments across the dinner table. Being forced to run errands together. Sitting through long family vacations. They know each other far better than either of them probably should.

The problem is that somewhere along the way, something changes.

Maybe it happens after they’re left home alone for a weekend while the rest of the family attends a wedding. Maybe MC helps YC through a rough breakup, or YC is the only one who notices that MC’s relationship with their sister isn’t nearly as perfect as everyone believes. What begins as harmless conversation turns into lingering eye contact, accidental touches that neither of them pulls away from, and conversations that become increasingly difficult to forget.

Neither of them sets out to cross that line.

But the closer they become, the harder it is to ignore the growing tension between them. Every family gathering starts to feel like a test. Every vacation means sharing more time together than they probably should. Every secret glance across the room carries the risk of someone noticing.

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The idea isn’t 100% fleshed out, but I’d prefer to build the details together with my partner’s input and ideas. The tone can lean more dramatic, angsty, or softer depending on what we decide.

I’m especially interested in emotional tension, forbidden romance, slow burns, family dynamics, and mutual pining.

As a disclaimer, though I’m looking to write my character as the top, I’m not looking for a partner who only writes submissive and passive roles. Ideally, you’d be willing and able to write a power bottom, I want them both complicit in the relationship and capable of taking charge.

Kinks: Size differences (big top, small bottom), risky/public sex, rough/gentle sex, hickeys/marks, cuddling, kissing, choking, aftercare, groping, spanking, romance, flirting, grinding, cheating, possessiveness, power bottoms, biting, teasing, nipple play, etc.

Limits: Underage, beast, toilet play, bottoming, extreme musk or sweat, rimming, prolapse, gore,etc.

If any of this sounds appealing, DM me with a writing sample and any ideas you might have!