Even if that ends up being the case the real issue here is how out of left field everything is. We spent the last 2 chapters basically looking at random nonsense only to come back to the main cast having a pretty massive change up all because of a "big bang theory" tier misunderstanding.Has anyone not considered the possibility that Smiling Mina is actually just trying to teach Mina what love is through experiencing things like jealousy and possessiveness, and that what you're all interpreting as creepy behavior is just her way of pushing and teasing her into the right mindset?
Perhaps Smiling Mina has regrets about not appreciating her owner enough, and her previous owner is irreplaceable to her. The offer to take Mina's place could be just one part of her strategy to make sure another Mina doesn't end up with the same regrets.
It feels like something this manga would do, so you could all be demonizing a pure cinnamon bun angel right now...