Mother masturbated for daughrer

My wife showed our daughter how to masturbate and I showed our son

My daughter asked me about sex when she was 14,she asked if me and her father did it? To which I said yes,then she asked if he had a big dick as they had been shown in a sexual education lesson at school,I had a mould of her father's dick and showed her! Wow mum,dad's cock is bigger than the one at school! Does it hurt when he puts it in you? Not at all I told her and said sex was amazing! I could see she was interested and said do you want to see? What do you mean mum? Look I said and took off my knickers,I gasped sticking my dildo inside me and moaned with pleasure,you look as if your really enjoying that mum she said! Have a try yourself I said! She took her school skirt off and her knickers! I couldn't help but stare at her pussy and helped push her legs apart! I told her to rub her clit while I put some lube on the dildo! I slowly pushed my dildo into my daughters pussy!!

I felt sick when you said very hairy. Shave that shit

My new step-mom (this happened about 6 months after my dad married her) walked in on me using her vibrator when I was 16. I found it in her nightstand one day and had been using it any chance I got. I was stark naked, on my bed on all 4s, ass facing the door. She just cleared her throat and told me dinner was ready. I was so mortified that I stayed at a friend's house for the weekend, too embarrassed to go home. When I finally did come back, there was a wrapped box on my bed. Brand new vibe. The card read Have fun, lock your door! Love, Steph. We were totally cool after that.

My mom bought me and my 17 month younger sister a vibrator and a penis shaped dildo when I was 15. She also showed us how to use them and would masturbate with us about once a month.
I'm 46 now and my mom died in 2008 but we had masturbated together(and each other) quite a few times as adults.

How did it start?