Maybe allow the player to have threesomes with two girls of different choice or with girls who have a good relationship (friends, enemies, frenemies, etc.)
An item that allows the player to have a double penis thing
A small key track on the map or the girls giving out hints about where the other girls are able to be found
An item that can change the player into a female fully (not futa since it's kind of male and female mix)
Maybe allow the bot face thing to have different expressions or something? (it just looks to the right and does nothing) or perhaps make it to where it is actually a girl to be found and it's a protogen?
like one of the characters say "you should have pulled out" which basically leads to, allow the player to choose between cumming in or out of the female
tehcnically there is, you use the genderbend mirror on yourself then use the magic eggplant to remove your penis, which turns you into a full female. you can also do this to the animals to have an entire genderbent station. (Edit: even though the mirror says it only gender bends humans it also works on animals)