Watched Wife Molested

I went to a street parade with my wife and we were at the barriers. We got a little separated in the crowd and I ended up a little behind her to the side.
A group of teen boys were behind my wife. As I watched they started grabbing and squeezing her ass. She looked around for me in the crowd and I don't know why but I didn't show myself.
After a while one of them moved in behind her pushing his crotch on her ass. She again turned around and tried to move but they had her blocked in they weren't even looking at her acting like they were interested in the parade. She gave up and turned to watch the parade again
The boy behind her was moving his hips obviously humping her asscrack. I could of gone over and stopped them but I was so turned on. He started rocking harder and harder from where I was I could see my wife's ass jiggle every time he thrust.
He pushed in hard almost lifting her with the force. He was cumming right there in the crowd unbelievable. As he moved away another boy took his place and started humping too but my wife finally had enough and pivoted away and started moving out the crowd. I met her and she was asking where I was I told her I went to find a restroom.
We left after. When we got home we had sex and when I was ready to cum I placed her on her stomach and rode her from behind and pulled my dick out and placed it between her asscheeks she moaned and grinded on me so hard as I shot my load on her back and ass. I think she knows I was watching what happened.