Just to be very clear about this: The Prototype is still VERY bitter about her being a playtime co employee. However given that she's pretty much almost always listened to him, assisted during ✨the hour✨ and the fact that she didn't WANT to work at playtime co, he's decided to keep her as an ally. Also I have an OC that he's pretty much adopted and Lia is a mother figure to him (both before and after she was a Bigger Body) so he keeps her around for his sake as well. Things might change in later lore that involved a break in their agreement - but hey there's time and place to lore dump and it's not now hehehe.. (Also since he adopted them and Lia's a mother figure I feel like I need to specify I don't ship them. I ship Harlia.)