I fuck the plumber while my son and his friend spy on me and jerk off.

I am separated from my wife and it is the first time that my son spends the holidays at my house with a friend of hers. i make myself comfortable and try to relax when there is a knock on the door. it's the plumber. i don't know how he will leave the dishwasher, but he makes my ass like new by putting his fingers in it. what i never imagined is that my son and his friend were spying on me and jerking off while i came.