Apologies for failing to read this thread, but I see the "baddy" quite clearly as the err "Lady" for seducing the wee lad in the first place. She knows what she's doing AND how dangerous it is for him.
The Lord is indeed a calculated sadist too though (meaning in other words no other servant will ever shag her again whilst he's away!), but it's nevertheless quite probably in keeping with social behaviors of the time. For him it's purely a matter of 'honour'.