A threesome or foursome would make sense in harem mode. But it would have been nice to have the option to have Elly to yourself, versus basically having threesomes with her and the main character's sister as a prelude to actually having sex with her. Perhaps in the game there could be a place where your sister asks if you want her help with Elly. If you tell her no, it takes longer to have sex with her, but she is less corrupted when it does happen. Later threesomes become available as options, but perhaps they have an effect on your relationship with her as Elly becomes jealous?
Vanilla would be a nice change of pace after everything being corruption. And we're not asking for things to be changed, or at least I'm not. I'd just like the option for that vanilla route. I think there would be more interest in that than for the Emily focused route for the next update. And it would allow Luxee to add more life to a game that as you said probably doesn't have much life in it. But as you also said, that's more a measure of Luxee's waning interest. Clearly the fans of the game are still very passionate about it.