Actually one of my favorite headcanons is that Lupin is hypermobile and has a habit of pushing his body way too far on heists, so when they get a rare day off, Jigen makes Lupin rest.
He massages his sore spots, makes sure his joints are all in place, basically just does all the damage control and self care stuff that usually comes with hypermobility issues.
Lupin gets real quiet every time, for him its incredibly intimate; not only is Jigen touching his body for hours, but he's easing problems Lupin would never admit to anyone else that he has. Jigen is the only person in his life who wouldn't try to take advantage of it.

















