On these points are where issues pop-up. You see if MCs don't have a likeable personality then a porn is pretty fucked. So, there's a few options here. Have a self-insert with no dialogue, have a likeable character, aka, get a damn writer. You have a 2 million dollar budget in this case. And/or have a playable/controllable character that the player has some agency over. Failure to do this may result in jackass, unrelatable character that a potential player wants nothing to do with. Which will just weigh a game down.
Some games that aren't Subverse do a good job of incorporate all of the sex or otherwise weaving the sex in with plot in someway. Games that don't that are generally held back because the porn is either detached from the experience or you need to go out of your way to find it. Which may result in padding, lots of padding. No wants a grind to get porn.
I don't have a problem with the Captain.
Far too many porn games try to make the setting, characters, and narrative, some super serious melodrama affair. Which in turn just makes it impossible to care about any of them because of how stupid it all is. Pretty much all of these VN games using DAZ assets suffer from this immensely. Seeds of Chaos suffering from this in spades. Its impossible to care about anyone in that game because of just how DUMB it is in its attempt to be overly serious, which it doesn't do well.
On the other hand I enjoy Subverse, and its characters, because its not that. Its a lot of the same reason I enjoyed Evenicle. Evenicle has serious moments in it, like the few rape bits, but overall its an incredibly light hearted game, that doesn't take itself too seriously, all the characters are just enjoyable to be around, and a lot of the sex is just fun sex for the sake of sex. Its very self aware, breaks the 4th wall numerous times, and is generally comedic. And the main character, Aster, just revels in it. His whole motivation in the game is that he wants to marry his(adoptive) sisters, and doesn't like seeing girls harmed. He doesn't even REALLY care about being a hero, or saving the world, or anything like that. He just kinda get rolled into it in the process of wanting to get the ability to marry more girls.
Its also why I have been able to enjoy Something Unlimited, despite its numerous issues of never finishing anything until just recently. The game is just no nonsense "here is Lex Luthor using some mind control devices to make money on the hot DCAU female superheros". Its so just relaxed in its premise and presentation.