Only I know... Secret guide with my friend's mother

Shinji lost his mother before he could remember and was raised alone, but is attracted to the motherhood of his friend's mother, Miki, and falls in love with him. However, he is unable to let his feelings go through on his own and finally talks to his girlfriend. Miki teaches her sexual skills one by one to her, who is not yet experienced. At the pleasure he felt for the first time, Shinji forgot his words and continued to sway his hips intently. As he desperately devours her body, Miki's body can't stand the waves of orgasm that are surged towards him...