Christmas Tree Cover

Back in the late 90's I was having an affair with a friends wife. She was an amazing lay. We always met at hotels, car, friends house. She was always scared to come to my house fearing we would get caught. Then one day out of the blue she invited me to her house and said her husband (my friend) was definitely out of town. They had a small child and I figured she made sitting arrangements.
We didn't make it past the living room couch. I was naked sitting on the couch. She was wearing only a t-shirt and naked from the waist down. As I laid back and enjoyed she was on her knees sucking my cock. Then suddenly a voice surprised us both. I looked up to see her 4 year old standing a few feet from us saying "mommy, what are you doing"? I jumped up and ran behind the Christmas tree and she shuffled the kid back to his room.
She came back and didn't seem worried about it. We had a quickie and I got out of there.