Copying my comment from AO3: Ahhhhh! I loved this! I love how Sirius is trying to hide his feelings but how their fucking around is more than he's willing to admit perhaps even to himself. It's got that vibe I love in school days Prongsfoot, with them swooping over London skies and swimming in the pond and the sex is SO hot. Gorgeous, exploratory and the way James responds to Sirius gave me all the feels. Loved this, thank you for writing these two, I love how you see them! <3