ms. zamora saying anything? >> no, they were just doing it. it was very uncomfortable.hy the second day they were doing stuff, i just left the room. >> reporter: this friend says the alleged victim confided in him, begging him to keep it secret. >> like they're texting dirty stuff. i got instagram, they text dirty stuff. >> reporter: parental control apps or the rise, a big business projected to reach $9.5 billion by 2023. apps like family time and web watch are tracking mobile activity and blocking racy sites. these parents using one such app to discover those text messages. they say afterwards they received that surprise call from zamora which they recorded. >> can you explain to me, can we meet to talk about this? we can settle outside. >> oh, yeah. oh, yeah, that's what we can do, so i can give you a chance to do it to some other kid? yeah, exactly that's what we're going to do. no, do me a favor. do not call me back again. do you understand me? make sure you tell your husband what's going on. >> he is right here, can he talk to you? >> reporter: zamora put her husb