Is it normal to sext my friends mom.

My hot best friend (girl) has a very hot family. Her moms about 45 and has dd boobs. Her sisters in college and has dds. My friend is in high school and has c cups. There all blonde and are very good looking. The big thing is they are all incredibly flirty. The dad however, has an anger problem. He has never hit any of them but he has a tendency to overreact. He travels a lot. Her mom decided one day to open up to me and discuss her feelings and all her stress. We eventually became close. She has never cheated on her husband (she says) . But one night she called me and asked me to come over because she was depressed about being alone for the day. I misunderstood the timing though. She told me 50 minutes and I heard 15 . I got there and nobody was answering the door. So that had me worried since her car was there. The door was however unlocked so I walked inside, upstairs in here room to find the mom ass completely naked in here room blow drying her hair. I felt awful and was very embarrassed. She was too. But we had a very good relationship but we were able to put it past us. About an hour later she asked me what thought of her boobs. I was alarmed but I told her they looked very nice. She said her husband really doesn't appreciate her or her sexuality lately and she is very frustrated because she never cheats on him. By this point she was acting very flirty she said she knows about my reputation for my six pack and she wanted to see what all the hype is about. She was amazed and then she asked me a very weird question. She asked if her daughter and I ever had sex or if she gave me head. I said no, an then she said that she is tempted to beat her daughter to it. I got a huger boner from it. And she noticed. She told me that she doesn't think we should have sex but she needed something. So I agreed to eat her out and she would give me a hand job. So we did and it was one of the hottest things I've done. This was about a week ago and since then she's sent pictures and she wants to meet again and eventually have sex. But she told me she loves sexting me. Anyways is it normal to do this?