Finally able to take the mandrake leaf out only a week ago, Sirius was the first able to transform into his animal form- a big, shaggy black dog the same colour as his hair, with the same grey eyes. He, of course, refused to change back, as the entire Marauders gang was round and he wanted to brag, letting James throw balls for him in the woods behind Potter Manor, played tug with Peter and had a tummy rub with Remus. It was only later when Sirius was eventfully convinced to change back to think of his dog name, and they were all joking around when Remus leaned over and whispered into Sirius' ear
"you know, Padfoot doesn't have a dick,"
Sirius didn't respond, and didn't engage with his friends for the rest of the night, instead, he just sat there, thinking. /p