From what I can remember, recessive types have very low birth rates unlike the dominant ones. That's why they were quite shocked when Hyeseong got pregnant (I think from their first intercourse, during Hye's heat, with just a few cum from Dojin)
What do you mean? This just a manga where 48 manga artist working together to create all 48 positions right? But anyway if you talk about Amamiya Kayou story, then the characters looks a lot like: "Senjou no Hana, Juujun na Boku" (I Google it up) But it seems that there's no translation yet.
Please can some one give me a working link of this novel. I tried opening the existing one. But it's not working.