I've thought a lot about the idea of Marion eventually blacklisting a client by virtue of him being a creep, and him somehow managing to break back into the Chateau to retaliate against her for that, only to accidentally come across Jester's room instead and decide that, if he can't have the mother, the (previously unknown) daughter will do just as well.

Bonus - maybe the guy is Lord Robert Sharpe, and that's ultimately why she really had to flee Nicodranus.

+rough sex (pinning down, bruising, etc)
+he gets off on Jester being a virgin
+he taunts her with the idea that maybe she'll get pregnant by him
---watersports, scat, blood, scarring