Pratchett, Monstrous Regiment: Polly has a wound which is bloody but not fatal. Mal is out of coffee, and has been for five days. Polly needs Mal to bandage her wound (and rebandage it over the next three days while Mal carries bloody!Polly to safety) and to keep watch; Mal needs Polly to keep her, if not grounded, then attached to the ground via a sturdy rope. I really doubt either of them would be in the mood for sex, but possibly established relationship.

I'm trying to think of something for the Lancre witches ...