Craig has a chronic illness and develops a thing for his home nurse, Tweek (Tweek might administer infusions or oversee some other regular treatment). Tweek isn't used to the attention and doesn't want to violate his professional ethics but Craig won't stop saying nasty things to fluster him. Maybe Craig makes Tweek ride him but anything at all would be appreciated
Craig/Tweek - caregiver fetish and medical fetishism