With Stalker-Kun about to enter the ultimate jacuzzi, I think an element that may go unnoticed in this chapter is just how powerful Mother, Father, and Akane are and what that may mean for Kogane's motivation. Kogane has said that she's not as powerful as her sister, and that Father has a lot of monster fox blood, and Mother showed her power over the last few chapters. I can see why, with such prominent family members, Kogane is so desperate to have an interspecies marriage. Achieving that sacred ritual will let her stand proudly amongst her family. Kogane's family is very supportive of her no matter what, but we can see the drive she has to achieve something important. It also highlights just how crushing the failure of her first attempt must have been.