Mom and son reunite in person after a decade

When our protagonist was a little kid, his mom and dad divorced and dad got custody. Son kept in touch with his mom though email and phone calls. Our boy has a fight with his dad and stepmom and mom offers to let him stay with her. Mom and son meet face to face for the first time in years and find they have both changed quite a lot. The son is tall and fit with sharp facial features and the mom grew her Hair to the floor and lost a lot of weight (except in her hips/butt). During the stay mom and son catch each other checking each other out. Mom wears cotton leggings and asks her son to take off his shirt to help her with her workout. Mom instructs her son to touch her hips/butt to help her exercise. After the workout, Mom asks her son to help wash her Hair. (I have a Hair fetish. It is going to be a signature thing in my works.) This evolves into a Hairjob scene. The two finish the night by going to bed together and fucking like rabbits.