"Thank you Katsuki, you are a very good person. Shouki is lucky to have you, I hope you and Shouki also have children soon after this. You are good people," said Eijiro
"Yes, I hope so too. I really miss the presence of a child in my relationship with Shouki. I want to be a useful omega for him, what's the point of an omega if you can't have children?"
Eijiro took the initiative to encourage his ex-lover. The despair behind Katsuki's eyes. The blonde haired man must also be in a slump because his body condition is still not able to support the goal of being able to have children.
I don't know what is the main cause of Katsuki's unsuccessful pregnancy program, it's all inseparable and not far from what Eijiro has done. Eijiro also has a fault related to why Katsuki can't get pregnant.