Steamy incest - Mother and child bathing

Rin is a family of three, her husband and her husband's stepchild Akira. However, these days, my husband is busy with work and isn't at home, so Rin and Akira have been living together. One day, as usual, when Akira tried to take a bath, Rin had already been in there... And without realizing that Akira was watching, Rin plays with her crotch and starts masturbating...