hmmmmm. okay at first glance i'd say either the occasional dealer/dealee relationship if he dabbles in something as tame as pot or the occasional adderall, or they go to the same therapist and recognize each other well enough that, if/when bumping into each other on the street, they're like hey, i know you. or idk, both, therapy first and then she hears about someone who can get her what she's looking for and is introduced to him and the lightbulb goes off? just tossing out ideas, hah