
oh he def does if this get out he has a thing for his sister and they might investigate if shes truly his sister or not, although the nobles dont gaf about morals. he still has a reputation and he needs ppl to think shes his sister so he doesnt marry that villainess. hes just mad that he gets hard for a commoner and that shes also indifferent to him and not how she was like previously.

Exactly!!
Even if he's a noble they still had to hold the appearance of morality. Incest, especially between direct descendants was heavily frowned upon and scandalous. That's why we have stories gossiping about relationships like Cesare and lucrezias dated to their times.
Even if cousins were allowed siblings were a no-no. He would absolutely get judged for that, and he'd absolutely care because he's NOT nonchalant. The only reason ppl might think so is cause he does whatever he wants, but that's cause what he does is already in the expectations of nobility.
Not to mention as you said it could lead to investigation which just derails the whole reason she's there in the first place....he's just mad cause he's a clascist fuck with the personality of wet cardboard...he can't handle allat
The point flew over his fucking head
Bruh. Est the rich already he's not getting it.
Also he's a bastard but I'mma admit he did look nice with his face flushed all docile. Every other moment he's a walking std though
Imagine they get at it and then he moans his sister's name. Id like to see him face backlash for how fucking weird hé is gosh I hate nobility