I Didn't Believe My Eyes

I arrived home very due to circumstances at work, when entered the house i herd my wife saying take your time make it last, I knew by her tone something sexual was happening, i walked up stairs slowly and peeked in our bedroom and saw what I couldn't believe, my wife was recording on her phone our son naked and wanking, I didn't spoil the moment, and quizzed her about it later, her excuse was she caught him wanking and he asked her to record him, I can sort of understand he has a more than large cock, have suspected something was going in but denied it to myself, I asked her if there were any more recordings of both of them, she wouldn't answer, I suspect there is do i want to find them