Alright since you're someone that's been on the website and you did state in your comment "Not a troll" Let me answer your question simply on what's the need or crave for these games.
So there are Four elements people like about fem protag the most ->
First is lesbian the simplest -> some people just prefer lesbian porn and having the ability to play as one and not worry about dick at all is there , so that's one.
Second -> The demand for corruption / seeing a innocent person eventually succumb , it's alot like seeing a girl you knew from highschool that was somewhat shy but is now sucking dick , seeing the journey is what hits for some people
Three -> Fem protag games also gives the player the ability to have various fantasies , Let me explain as a guy what can you do? You either go college in porn games , you're some stud that can fuck anyone , incest , you're a loser that's getting chicks and milfs , or well ra*e.
Fem protag on the other hand allows you to control all aspects of this , you can work , you can do incest , you can have lesbian , you can have corruption , exhibitionism , blackmail , groping and etc
Fourth and lastly -> Fem protag basically is you controlling a girl and her life , there's also an aspect of hence then NTR , cuckoldry etc without worrying about it since they give in , it's the reason videos of japanese chikan , party hardcore and stuff get so famous because they give you a girl's perspective and some people assume it's their girl instead. ( I know odd but hey we're on a porn site so judgements aren't exactly a good thing)
Now for your multiple protag question , its multi protag because you do actually control some aspects of the other girls and events example being lana and bellhop , the molester and natsuko , however kiara is the only one that actually has stats , meters that get affected.
Secondly It has a male protag story , we have the renders ready , we just need to ask if they wanted us to make it separate or within kiara's story herself , so yeah depending on how the poll ends we may introduce it , however we're happy to create a separate game too but i would need support for that since hiring takes money lol
Hope that answers your question.