It is not how things works to just add as a normal gameplay skill. Gameplay and levels designed differently in human and in werewolf form. If you could just turn into a werewolf at any time, the horror elements would not make any sense, so as the hide and seek with the Alpha Lycan. So what you are asking is to change the whole game design...
Pregnancy also can not be a main element, because the whole story happens in a few days.
Personally I understand the difficulty of adding significant content that might affect the rest of the game's design if people expect it to be included everywhere, that's why I'd be very interested in seeing some of these potential "bad ends" explored for the character if they lose/are defeated in battle, after which there is some scene where the character has transformed or otherwise lost themselves to the monsters, after which you're forced to reload a previous checkpoint and try again. Seems like that'd add interesting lewd content to the game, while also keeping it contained in a way where you wouldn't have to implement new scenes or mechanics all over the game. Could just be 1 or 2 scenes per enemy type and/or enemy gender.
