Parenthood

It is a great loss to Japan see the death of a family from an already endangered Japanese (were)wolves. Unfortunately, the child(who was the sole survivor) has nowhere to go to so the ministry thought it's best for him to grow up with someone of the same race. The gay social worker in-charge with the kid developed a crush to the werewolf writer that's teaching the child.

After being abandoned by his lover, Motomi vows to become an artist. One day, he is brought home by Nueno Koji, the artist he admires. That night while resting in Koji's room, Motomi accidentally saw what was going on in his neighbor's house through the window, and unexpectedly it evoked uncontrollable excitement and lust.

On a full moon night, Makoto accidentally picked up a puppy, thinking that the dog was abandoned, while sympathizing, Makoto took the dog to care and the next morning when he woke up, he did not see the dog. Where instead is a cute white kid and he said he needed to find his papa.

So what does he do in the end, and who is his papa?

Wataru (this manga's MC) despite appearing spoiled actually has dreams of protecting his sickly siblings by standing up w/ his own strength, not by the riches of the family who made him heir and neglected them.