Well, he's gonna be the MC regardless of who gets to marry his daughter in the end. After all, the game is called "Dating my Daughter", doesn't specify who needs to date his daughter
There is a level of ambiguity to the title for the uninitiated, but the game makes it pretty clear from the outset that the one and only person who'll be dating the daughter is the MC.
The thing is, there's "corruption" tag. What's the point of it if you can't go deep into the abyss (assuming the player wants to or makes poor choices) and the only possible outcome is a lovey-dovey vanilla happy ending? A couple of threesomes with D hardly count for corruption.
MC gets to be a manwhore with all kinds of hot chicks without her knowing, but he never gets into trouble for it, he only wins extra sex. And god forbid that MC allows D to have some autonomy and date other guys on her own, too or have a proper open relationship based on honesty. There's even a game over scene if you don't take self-defence classes which was a massive cop-out and middle finger to player choice. Why not give the player more agency to choose the outcome for MC and D's relationship? Let MC get busted during cheating if he gets too careless, with some serious consequences that make the game more interesting and less predictable. If the game presents itself to be a romance novel, then there have to be ups and downs, various challenges for the player to overcome to make it interesting, and natural character development. As it is, it doesn't have any where player's involvement is required, because apparently many supporters are too afraid to have any freedom or responsibility to shape the story they want to see. If the player's involvement is not important, then it's not a game, it's a kinetic novel.
D went from naive virgin to an incestuous relationship with her own Dad, getting engaged to him, potentially pregnant with his child, having lesbian experiences, FFM threesomes, MMF threesomes, and sharing foursomes. How does that not qualify as "corruption"?
Of course the MC gets to be a manwhore with no consequence, that's what adult games are generally all about; wish fulfillment. Being able to fuck loads of girls at once without paying a price for it, or having the girls be OK with it and get involved in a sharing/harem relationship, is the archetypal male fantasy. Can't really blame MrD for leaning in to that, especially when the popularity of the game speaks for itself.
As for D, she's a loyal girl who loves her Daddy more than anything else. She therefore has no interest in other guys or even girls as solo pursuits for herself, so even if her Daddy did say he was OK with her to go out and be with someone without him, she clearly doesn't want that. She wants to share these experiences with him because his pleasure is her pleasure. Therefore the level of player involvement is just about who you want them to share experiences with, if at all.
Few games give you the level of freedom you seem to want this to have. They're all basically kinetic novels because to put in that level of choice and diverging paths would mean that games would have to have many more renders produced for them to accommodate all those different paths, and that's just too much work for pretty much every dev. Therefore it's far easier and more economical to just have the story follow a relatively linear, kinetic track, but just let you choose how certain relationships are within the game, and that's what this one does.
Yeah it looks like the final chapter is going to be a trip down vanilla lane. Such a shame, so much build up for nothing. It would be as if in the movie Titanic the ship bumps into the iceberg but then just sails on past and everyone plays shuffleboard on the sunset deck for the rest of the voyage.
Been out of the loop for a while, but let me guess; no more MMF sharing but the FFM will remain? Because that tends to be what people mean by "vanilla" in this thread.