Delinquent Daddy and Tender Teacher, book 2
Tama Mizuki

Hitsuji and Hatoyama are officially a couple! And with Hatoyama's young son Hinata to look after, the three of them have started to settle into a new kind of family life. However, these lovebirds are about to learn that relationships aren't all smooth sailing. They'll soon be tested by awkward family introductions, unexpected illness, and a misunderstanding or two. But love will always win out in the end...right?