https://www.dlsite.com/comic/work/=/product_id/BJ326924.html As always, please support the artist and buy his works.
Married woman and a Junior
For some reason, Mizuki ends up in a sex friend relationship with her daughter's friend Hinata. Even though she knows that this kind of relationship is not good for her, However, she is pushed into it by the always aggressive Hinata and allows herself to be with her. But at the same time, Fukatsuki herself is not averse to the act with Hinata. ...... Are these feelings love or sexual desire? A heart-pounding immoral comedy about a married woman and a high school girl who waver between the lines of ethics!
English Webtoon by the same author: https://comiko.net/series/123957/does-it-count-if-you-lose-your-virginity-to-an-android-official