Fanfic Prompts for Any Fandom, Any Pairing

Character A needs a date to an event they can't skip — a wedding, a reunion, a work gala — and Character B agrees to play the part. They build a fake backstory, rehearse how they met, and invent small couple habits. Write the moment one of those rehearsed habits stops feeling rehearsed, and neither of them says anything about it.

A booking error, a snowed-in motel, a safehouse with exactly one bed. Character A insists on taking the floor; Character B refuses to let them. Write the negotiation, the careful pillow wall, and the conversation that happens at 2 a.m. when neither of them can sleep — the one they could never have in daylight.

Character A and Character B have spent the whole canon undermining each other. Now a problem appears that neither can solve alone, and they're ordered — or forced by circumstance — to cooperate. Write the mission going wrong in a way that requires each of them to use the exact skill they've always mocked in the other.

Character A has a secret — a double life, a hidden ability, a past under another name — and Character B is the one person they've managed to keep it from. Write the scene where the secret slips out at the worst possible moment, and Character B's reaction is nothing like what Character A spent years bracing for.

A storm closes the roads and traps Character A and Character B somewhere small — a cabin, a bookshop after hours, a broken-down train car. There's no danger, just time. Write what two people who normally avoid each other do with forty-eight hours, one deck of cards, and no excuse to leave.

Character A writes out everything they feel about Character B — a letter they'll never send, a draft message, a voice memo meant to be deleted. Through bad luck or a meddling friend, Character B receives it. Write the next conversation between them, where both pretend it didn't happen and both fail.

Strip your characters of the canon plot and put them in a neighborhood café. Character A works the morning shift; Character B orders the same thing every day at 8:14 until the day they don't show up. Write what Character A does next — and what their reaction reveals about feelings they hadn't admitted to themselves.

Character A and Character B are assigned as partners on a semester-long project in a class one of them is acing and the other is failing. Write their first study session, where the failing one turns out to understand something the acing one never noticed — about the subject, or about people.

Take characters from a fantasy, historical, or sci-fi canon and drop them into an ordinary modern life: rent, group chats, IKEA furniture. Write a scene where a mundane problem — a missed bus, a broken phone screen — triggers the same dynamic the characters had in canon, just scaled down to everyday stakes.

Character A runs a small shop. Character B opens a competing one directly across the street. They sabotage each other's window displays, poach each other's regulars, and know each other's schedules suspiciously well. Write the day an actual crisis — a flood, a break-in, a chain store moving in — forces them onto the same side.

Your characters are a band on the edge of either breaking up or breaking through. Character A writes the songs; Character B is the reason half of them exist, and doesn't know it. Write the rehearsal where Character B finally pays attention to the lyrics.

Character A is stuck repeating the same day. The loop only ever changes in one way: Character B's reactions are never quite identical, as if some part of them remembers. Write the loop where Character A stops trying to escape and starts using the repeats to learn everything about Character B they never bothered to ask.

Character A got hurt during the last mission, fight, or disaster — and hid it, because the team needed them functional. Character B is the one who notices: a flinch, a favored arm, a jacket worn indoors. Write the confrontation, where Character B's anger is really fear wearing a disguise.

Character A and Character B part ways on an argument — petty, unresolved, full of things said badly. Then Character B goes somewhere dangerous, and for a stretch of hours or days, Character A doesn't know if they're coming back. Write the waiting, and then write the reunion, where the argument suddenly costs nothing and admitting that costs everything.

An accident, a curse, or an enemy's weapon takes Character B's memories of Character A — only those. Everyone else remains familiar. Write Character A deciding whether to rebuild the relationship from scratch or quietly step back, and write the moment Character B, with no memories at all, starts gravitating toward them anyway.