I have no objection to that. If you don’t cheat on her, and you don’t go down the sharing path then she absolutely could be as devoted to you as you are to her.
But if players want to fuck everything they can, and go down the sharing path, then let them.
it would be choice based. If you want to share her and see her with other men then have a party. But these harem games wear on me.
Man of the House has the MC have sex with his mom, his sisters, his aunt, and like ten other women around town, but the game maker decided it would be that way. Only the MC and everyone else. Most of the girls are bisexual, but other women is all they get.
Parental love is the same way, the wife, the two daughters, the sister and another young woman, all just for the MC, and the girls are all bisexual.
I would just love to see a game allow for a female character to explore her own needs, like some of the LOP Gold games do.