Maybe you are right at the end of the game, but right now, Sharon is treating the MC like a dog pet: giving him the exact amount of attention and affection to maintain him on the hook, while he's useful to her, but without doing for the MC something that really could have a deep romantic meaning, costs her some kind of sentimental risk, or committing her feelings with him in some way. Just gives him little things like a kiss when she's in good humor, buy her a little office chair to make him feel that he's someone, or letting him see her nude sometimes. And he has to make like he doesn't mind the disdains that she inflicts on him sometimes, and the humiliations from Astrid, someone way more important in Sharon's life than him. And he can't "counterattack" with his own charms and seductions "tools" since LikeBlondes has make the MC a "beta" that even can't have erections every time he feels horny. The MC is condemned to be Sharon's dog so far. Yes, he has some "powers" as vampire, but those are not the MC´s merit, just something that he owns to the female that "created" him.