Free! Head Canon
So I have developed this hc that Nagisa is like really really strong. Like, he looks kinda scrawny but one day, probably, Rei overwork a himself or is sick and ends up passing out so they have to take him to the nurse and Nagisa just picks him up bridal style with ease and everyone else is just like ’???????How????’ And Nagisa just shrugs and carries his tol bf to the infirmary.