You've met Tecnik, Flèch, and Qirin, so now the question is, how did Nick get involved in this group before his fusion with Tec? The answer, Oro.
Oro is a rather demure individual with a few medical issues--namely his nerves. He gets cold easily, tending to dress in baggy clothes even in summer, and his feet get sore if he's up for too long. He wears a brace due to his left leg being weaker.
Nick was Oro's hired masseuse, the fox letting the pink male tend to his feet with his skilled mouth. Flèch stumbled upon one of their sessions, and despite Oro's embarrassment about it, convinced the fox to let Nick serve all of them.
Oro still makes sure to pay Tecnik for his work, of course.