Rather than Bocchi giving more value to Kita’s virginity, i feel like Bocchi’s last question is about her own insecurity when it comes to Kita’s feeling for her. She seems to be worried about whether Kita is serious about her.
On Kita’s side, this casualness around sex with Bocchi seems to be some sort of coping for her possessiveness, which is also a type of insecurity: she’s worried that Bocchi won’t stay together with her, and this casual sex is somehow her solution to that insecurity.
Very nicely written story.