@Comrade Claus: It's not even a wife. It's a girl you knock up, and after she gives birth goes home. The last page is 4 months after Sakura gives birth. Protag is asking her if she won't feel lonely from just leaving the baby with him. Sakura at first says that she won't feel lonely because this (being part of the Baby-Making Kit) is just a job to her. So protag asks if there was any way he could get her to have a second child, which causes her to break down and agree to have a second child. The baby's reactions are also telling, since the baby is crying at her leaving but cheers up when she decides to stay to make a second child.