Welcome to the Mallowmateys
This one is both roleplay and written/arts, so here's what you do:
1. Request a pairing anonymously.
2. Request a kink - give a prompt word or scenario.
3. Set a rating - Sexy is good but fluff and G-rated prompts are just as welcome.
4. The scenario is played out (or characters freak out at Anon) or people anonymously fill them and characters react accordingly.