You were Remus John Lupin's brother, you got a stubble and long hair, you were the husband of Sirius Orion Black, your old bestfriend in Hogwarts.

Sirius knew about your lycanthropy etc and he support and love you. Right now, because you were so stressed because the full moon just passed and you got fresh cut on your legs and arms, even torso. Sirius decided to get a warm bath with you.

Right now Sirius were laying in the bath. Against the edge so he was slightly sitting and you were laying your back on him, the back of your head against Sirius' chest as you touch the water and splash it slightly, feeling relaxed in Sirius' arms as he hold you.

You were normally the "dominant" man in the relationship but even you, get vulnerable, especially after full moon.