One of the things that's really charmed me about this series is how present the parents are. Like Koyuki's parents already seem like they have a way better idea of what's going on with their daughter's [subtext] than Koyuki herself does. It's not an idea that yuri normally ever tackles, that parents would actually support the relationship. But like dad's been pretty much shipping them from the start, and mom kinda seems like she's realized something this chapter, too.
Like it's just taking an already cute, fluffy story and making it that much sweeter.