In the original Judas Contract comic, it was established that Terra who was 15 at the time, had a relationship with Slade...who was like in his forties/fifties and despite Slade being the obvious predator in this relationship, the intent was from the writers to make Terra look like a slut for being groomed and manipulated(yikes). Anyway, I hope DC has moved away and retconned it in the comics but Young Justice season 3 did it better where Slade acts like a twisted father figure towards her and this is a much better dynamic given what kind of character Slade is.