bbcmusketeerskink

Basically one character really gets off on the fact that their partner is asleep, or totally limp and unresponsive and, uh, yeah.

Could be a negotiated thing where they discuss this ahead and they're like OK this is what you can and can't do and the active partner does it right and respects every limit and all. Or you could take the darker route where it's unconsciousness + non-con.

*slinks away nervously*