My wife masturbates so much she rips her panties off.

I didn't know my wife was masturbating until the other day when I accidentally saw her masturbating in her bedroom.
She was crying and rolling her ass up in her panties, and it was beautiful, and I got a hard-on, and then I noticed that she does that a lot, so much so that one of her panties pierced her clitoris because she was rubbing it directly against the corkscrew.
I started following the masturbation sessions and masturbating myself by watching. She masturbates hard, with her head under the pillow (I think so as not to make noise). A few days ago she turned around and tapped on the bouquet as I do when we have sex and I saw that she really likes it.
It's delicious to watch her moan and purr like a dog, with her fingers dripping from the bottle, when she goes to moan louder and doesn't care about anything else, sometimes she moans and keeps on masturbating all afternoon, moaning again and again.
I picked up one of her panties in her drawer the other day, and it was so pierced from all the finger-banging, I took the picture that's there.
I always go into the room in sequence, after a while, and I put my hand on her pussy, and it's all meaty and dripping, and sometimes I go in and make fun, and sometimes I just lick my fingers, and she never realized that I knew she was masturbating.
Do you think it's normal for me to like it and watch while I'm blowing it?