Mother's best friend

My mother's best friend, Kumi, came to visit me from afar. Akira is interested in Kumi's dirty body, which is obvious even through her clothes, but she becomes aroused and peers at Kumi's naked body in the changing room to take a bath. Kumi, who doesn't know anything about Akira, doesn't notice that he's being peered in, so he returns to his room and starts stretching. Akira can't hold back at her body flexibly in her underwear and is lewd like she's never seen before...