Do It For Her (Tits)DO IT FOR THE BOOBS!!!
So far food means sex if IIRC Kanra basically confirmed that they are food in the sexual sense for Succubus, if not exclusively. But it could still mean they're eaten after a certain point, or probably if they break mentally they're used as cattle (and milked industrially) since they can't enjoy themselves with them emotionally anymore, maybe?man, i still don't what it she means to eat?
is eat = sex?
or
eat = eat his human flesh and bone? then holy shit we enter gore tag D:
or
the most known Succubus way is eating means having sex too much to the point the guy loses his life and she looks at him with evil red eye and drops his dead body into a garbage bin like he is nothing but food