Written from the POV of the person doing the locking.
Invite them to a classic game
Set RP mode on
/change their life_points 0
Check dom/sub and kinks are set correctly for your situation
For F/FT -> FT - Set Fem Dom and Chastity Kink, and Dom/Sub (Locked in chastity)
For M -> FT - Set Anal, Feminization, Chastity Kink (Teach to cum in chastity) Note: some kinks here are reversed, so just set give/receive on for both parties to be sure
For All -> F - Set Chastity Kink and Dom/Sub (Maid to serve)
For F/FT -> M - Set Female domination, Anal, Chastity belts/cages, Humiliation (Cage his dick and finger his prostate)
For M -> M - Set Chastity belts/cages (Lock him up) -- Note: the person doing the locking for this one can't be in chastity themselves.
Have them pass the turn to you, then redraw actions until the ending above pops up, and select it.
Quit the game, enjoy
You can keep some notes on this character. You'll be the only one to be able to see this: