Yeah I could see it. Maybe he likes turning others (or himself) into terrifying bloodthirsty (or incredibly horny) monsters to fulfil his power/being overpowered fantasies. I think he'd like the rush of feeling so much stronger as he slowly slips into his new form. Or savors the pain and sorrow of the other person as the painful transformation turns them into a hideous conglomerate of sheer agony, like a sentient blob of flesh and viscera.

To be honest I have a bit of a niche kink for droidification which combines latex, transformation and hypnosis. In which perhaps Medic (or someone else subjected by Medic) feels sentient black goo encase them and slowly transform their body into something more useful to be a good little pet droid. Maybe robotification instead where Medic gets captured by Gray Mann and the robots hold him down as liquid metal encases and turns him into a good lil medicbot, including his legs becoming the wheel, his eyes becoming optics, his dick either being forever locked away, disappearing entirely or becoming shaped like a drillbit. And throughout it all he's simultaneously horrified and aroused.