Mom teaches sina how to have sex on vacation, masturbating to hentai.

My Mother is an erotic manga by Thai artist XTER about a college student who goes on vacation to a beach resort with his mother. After they've exhausted themselves at the bar, the guy heads to his room, but is caught off guard by his mother, who wants to talk to him since she found out that he and his sister had a sexual relationship. And just like that, one thing led to another, an attempt to defuse the situation with his sister ended in a tumultuous passionate night with his mother for the guy.