This is lavish and beautiful and perfect. I just, I can't put words to it, but it's such extravagantly lovely prose, it evokes love and wonder and change, sometimes with the lightest touch and sometimes with all the great weight those things require. I love your Sirius and his ridiculous interior monologue and I love how in love he is, how much he wants to do things right, and how much Remus loves him in return. And in its way, it's heartbreaking - all that growing old together they're never going to have! Oh, so lovely.