Imagine your OTP finding out they can’t have kids, and Person A really wants to be a parent, while Person B wants someone to carry on the legacy. They talked about a surrogate carrier but it was too expensive, so they go to an orphanage and try to find one kid they’d like to adopt. Person A looks at all the athletic kids and Person B looks at the ones that aren’t as social. After days of going back to the orphanage they decide on adopting two that are about the same age.
A while later Person B breaks the news to Person A, asking if they have one more room at the table. Person B is pregnant with a little miracle baby.