Remus who can’t swim because of his physical disabilities which mostly affect his legs and hips and back. Remus who, despite being a little scared of it, loves the ocean and water. Remus who feels bad every time he sees somebody swimming or a pool.
Sirius who is a very strong swimmer and puts Remus on his chest to just exist in the water with his feet off the bottom for once. Sirius who invests in pool floaties so Remus can swim on his own. Sirius who teaches Remus how to float on his back so he can be in the water without floaties.