I don't think it's his mother, but probably his stepmother. She looks very young. In videos of this genre, I like listening to the dialogues of the characters, I liked the scene in the shower when he just walked in. From the fact that there was no embarrassment, we can assume that this is not the first time they have done this while her father is not home.
If a girl doesn't get an orgasm, she needs a specialist. The doctor quickly figured out the problem, pulling the hottie on his doctor's tool. And the therapy seemed to do the redhead some good!