This is probably the most traumatic thing he could do to her at this point, I mean the plan does seem to be to force her to have sex until she's eaten alive...
@Sep10trion That guy is kinda on a different Level ... honestly unlike the Kaifuku MC the only reason that guy isn't a Villain is because his targets are just reeeeeeeeaaaallly terrible People, No good guy feeds a guy his own children with a delightful smile no matter how karmic (and kinda freaky awesome in a mind bending disturbing way) it is.