Hmm I can't help but notice your profile has several Fate things throughout it. Would you perhaps be interested in doing a Fate Grand Order RP? My interests lie primarily in the areas of accidents and humiliation, for reference.

The primary idea I had in mind was Boudica putting someone in a diaper after they have an accident, potentially from fear of the enemy monsters or other circumstances. I'd play Boudica, you'd play the baby, it could be Artoria or Artoria Alter, since she canonically treats her as a little sister sort of deal already, and the humiliation is even better with the alter version. It could also be the master, or some other servant(though preferably not a loli one, I'm not really in for that sort of thing). An addition of the master deciding that this diaper thing is working out for them/another servant and forcing all the servants into diapers would be good, as I like playing a diapered girl even when being the dom.