Yeah this. Aoi grandparents agreed with marrying her with Eiji.
The old man in this chapter is Eiji's grandpa from his mom side. Remember that Eiji's parents has issue with their marriage due to social standing.
Safe to say the grandpa is still an asshole.
To be fair I'm juat curious if the vampire guy only suck women blood, and if that's by choice or needs.
Though now I just recall some fictions (at least japanese one) regard that Vampire sucking blood as intimate act for them.