Yeah, it sucks. Bisexuality is too often used as a way to endear a sapphic narrative to a straight male audience. It's a way for them to have their cake and eat too, enjoy the taboo or novel nature of the act while still maintaining the illusion that they could be a part of it. I hate whenever I watch or play something, and there is this wink from the writer that is as if there to say, "Don't you worry, bro, these girls will still suck your cock." Once you get into a lesbian relationship, you realize this extends far beyond just the internet. Men leer at you, follow you, get way too close; gay clubs are really the only public places I can feel fully comfortable holding my girlfriend's hand. For so many people, we, lesbians, are just a porn category. For them, we are all bisexual.
With all that being said, bisexuality is real and valid, and I know many irl people whose sexuality is very similar to how you describe the mc. Ultimately, it's all about how you handle the topic, but I didn't play the game, and I don't plan to, so I can't really speak on that.
As the cuckoo in the head Lesbian, I can say it is shitty when the MC somehow prefers Dick when I literally pick the worse option when the game forces me to interact with male LI. Sure, MC can be bisexual, but at least add a trigger to your game that notices that my MC literally always picks the worst option when male in sight or makes the MC slowly change based on the love interest they choose, because, as a writer, I can say that people keep forgetting that your relationship will change you, whether it is for the better or the worse. So MC liking Dick is not my "Ok, I will stop moment." If the game has good writing and the MC's way of thinking changes the longer they date the female lead, I will still play it. At least it is not a "Surprise Rape" or "Surprise Straight Sex" on your face moment, and players are not given a choice to avoid the scene. Like fucking hell, if someone tries to rape me, I would bite their dick off first to death as first choice and if i can't i will simply kill myself.
On one hand, the quote on quote "Lesbian" game is, as you said, part of male fantasy. But I will say that even if the writer is a lesbian, that doesn't mean it will be a good "Lesbian" game. Why do you ask? Simple.
FUCKING POLITICS RUIN EVERYTHING!!! SOMEHOW, A LOT OF GAY PEOPLE THINK IT IS A GOOD IDEA TO SLAP POLITIC INTO A LESBIAN GAME!?!?!?
I will tell you something that will be surprising for people with this kind of thinking. The ones that will play or buy your gay ass game will also be gay ass people or people that support being gay.
YOUR MESSAGE DID NOT REACH THE PEOPLE THAT NEED TO CHANGE THEIR MIND ABOUT THE STATE OF THING!. BECAUSE STRAIGHT PEOPLE PLAY STRAIGHT GAMES!?!?!? GOD WHAT A PLOT TWIST ISN'T IT?!?!?!? Who would have thought that Gay/Lesbian game is played by Gay/Lesbian People or People that support Gay Relationship!?!?
Of course, there are still some straight people who just want to jack off to it, but they only see it as a jack-off and nothing else. The chance of a game reaching closet gay or lesbian people who will join in on your political movement is extremely rare.
I DON'T WANT TO BE REMINDED ABOUT FUCKING POLITIC IN MY FUCKING GAY ASS GAME!!! YEAH SURE JUST REMIND SOMEONE IN A COUNTRY WHERE BEING GAY IS PURE HERESY OF HIGHEST ORDER!
Surprisingly I'm not joking in this, some country really treat gay (and trans) people as a Heretic that sold their soul to the Devil.
Like sure if the Devil can really give me a Lesbian Succubus I would sold my soul in the moment but nope, we are in real life where the the Devil are pussy ass coward that never give cool deal to people.
Personally I don't trust a game that label themselves "Lesbian" Game. I only trust a game that label themself as "Yuri" Game. Why? Because people that stample their game as "Yuri" game prefers the Japanese Way to handle Lesbian, It is a cruel yet bittersweet or just plain cute sweet, and they never bring politics or rant like a lunatic on why "Woman shouldn't be treated this way",
I FUCKING GET IT, IT SUCKS BUT I PLAY THIS SHIT TO RELAX NOT GET DRAGGED TO POLITICS AGAIN! EVEN IF THAT POLITICS BENEFIT ME OR SOME SHIT.
I don't care if you are a real lesbian or some dude with a lesbian fetish or a translesbian
JUST DON'T FUCKING REMIND ME OF POLITICS.
I play Yuri Game as Escapism. I lived in a shitty country with a shitty religion and shitty people, so I want to escape that.
And if you are asking me why I'm still in this shitty country...
Once a Coward is always a Coward, yet this mere Canary in a Cage always stares into the Sky and Dreams of the Sky above.
Yet despite the Rusty Lock of its Cage, the Canary still foolishly stares into the Sky without trying to break its Rusty Lock.
Sorry for depresso rant.