I just realized I got distracted in chapter 2's comment section and forgot what I meant to say then. But, well. They told their parents they want to date. Now they live together again and sleep in the same bed every night.
Meanwhile, the mom is just over there like "Yep, that's why I bought them a bed for two in the first place. This is my fetish." She seems more like a shipper than a parent in some of these interactions.