Ed was surprised by the new training singlet his coach gave him. He felt naked in it, his body barely covered by the straps lining his body. Its mesh material allowed his skin to show through, something he wasn't sure he was comfortable with. Supposedly it was to help him practice and reduce chafing, allowing him to feel more of his body while he wrestled on the mat with Coach.
His coach was a large furry man, some old hefty athlete tasked with training new men. He'd taken Ed under his wing, giving Ed special treatment as a new underling. Each time they met was one on one, Coach giving Ed instruction while the two spent time on the mat. Ed trusted Coach enough to do what he suggested, but even then, Ed had his doubts.
All the new singlet seemed to do was allow more of Coach's sweat to get on to Ed's body, only for Ed to end up going home smelling like Coach after their sessions. Ed would feel funny every time after however, almost like the smell had an affect on him, his mind fuzzy and unable to focus. He would find himself listening to and obeying Coach in this state, slowly losing the capability to think for himself.
The strangest part was when hair started to grow all over Ed's body. It seemed to match Coach's own pattern of body fur, even smelling like it too. It went as far as Ed quickly growing a full beard to match Coach's. Ed had never needed to shave before, never needing razors or clippers, and now had now option but to let it grow out. Now every breath he took felt like breathing straight from Coach's armpit, his mind held constantly in its complaint buzzing state.
Their roles began to shift, the two spending more time together, Coach and his obedient boy. The two began to look more and more alike until they started being mistaken for being related, a dad and his growing champion son. Ed no longer had the capacity to care, just an athlete made the way Coach wanted.