There should be more Remus/Tonks/Sirius fics in the world, really. And I love how you handled the complexity of their relationships here, Sirius's reluctance to touch his cousin, his refusal to have children (I always believe this is why he won't ever ever marry, no matter his sexual orientation), Remus's gentleness, and Tonks! I always like her strong and confident. So unlike the insecure, clingy girl she appeared to be in Deathly Hallows.

This is beautiful!