"We're not related by blood, but we're real parents." Now that same-sex marriage has been legalized ...
Though, it's tagged as yaoi, it's clearly a slice of life shounen ai and a good one as well. It really goes in the realistic aspects of what's it like to raise a child as gay parents. How to face a society that'll question their parenting and how to raise a child to face the society that'll question their parents.