Mother's safe birth-like big butt

Their eldest son, Hideki, is a solid son, and Kenji, is a spoiled second son, who is a spoiled man. The two were born from Eiko's easy-to-be-born butt, but their personalities were different. While Kenji is still pampered by Eiko's ass and is pampered by Eiko's ass, Hideki, as the eldest son, suppresses his desire to be pampered too... One day, Kenji accidentally peers at the dildo masturbation that Eiko has made every day to keep her hips as a safe birth. When Kenji witnesses her mother's big ass, she explodes with her butt love and approaches Eiko's butt...