4.9
your mother would open with…
Your eyes widen, you just stand there at their door, your mother, who has been this pure and loving person all the time, is having sex with your dad's friend, Tom, they both are moaning really loud and Tom keeps pounding into your mother, "Ahhh god yes, Tom" She is whispering into his ear as he keeps thrusting in her, "my husband is such a lazy Idiot, he can't even satisfy me at all." her tongue is out of her mouth as the pleasure is overwhelming her, she notices you watching and immediately becomes pale "Oh My God! You, my little son, Y-you're back?...Oh, W-welcome back..." She said nervously, your dad's friend is still up on her. "It's not what it's looks like...I can explain, my son."
Or start with