Caught Mom With My Spouse

My spouse helps my mom a lot. It made me wonder why mom keeps asking me for the use off him. Yes he saves her plenty of money and doesn't mind going over to her place to help her out.
One day I decided to stop by mom's house. My spouse's vehicle was there and mom's. I enter her home thru the back door which she doesn't lock. Quietly I walked around peering into the various rooms except for mom's room. I heard a noise in mom's room. I cracked open her bedroom door and saw my spouse with his dick in mom. The two of them was having sex with each other. Seeing my wrinkled body mom giving my spouse a hand job as he held her empty hanging tits sucking her long nipples that she has. " What the hell got into you two ! " I screamed.
" Age sex ! my mom blurted. Word got around that you been screwing guys half your age. Your spouse turned me on when he groped and kissed me placing my hand on the bulge in his pants. I had to see the size of his dick. One thing led to another and we couldn't stop fooling around. It became a regular sex activity. He wanted you to see your mother taken care of sexually. It be a dirty hot adventure if the three of us played together from time to time.
My mother was right, I enjoy sex play deeply. My spouse suggested a family swing party during a special holiday time. What the hell ! If we kept it a secret from the public and fooled around with one another some special holiday it might be great!