Lily + Samantha won't happen, it skirts too close to incest, and I don't wanna push the boundaries of what's allowed on the platforms. They will have more interactions and story, but no threesome with the MC and Samantha and Lily.
Viewing post in Special Harem Class - V0.4.7 Public Release comments
Ah, I see. A scene between the two of them would have been really hot, but I understand the platform's rules regarding that sort of thing. Still, it would be great if Samantha continued to star in more sex scenes and threesomes with the main girls (except Lily). Finally, my favorite girl, Samantha, is going to have more scenes—haha. Don't judge me, but I'm more into the MILFs in these games—haha—and her design turned out really well; ever since she appeared, I thought she’d be a main girl—I would have liked that. After her comes Claire, who I also find very sexy; I really hope the two of them get a threesome scene—that would be the best scene in the game.