Even if it's just once, we can still have sex... A mother who falls into depravity after being brought to multiple orgasms by her son. (Mise Yumiko FERA-134)

Koji, who is bad at being scolded during sex with his girlfriend, asks his mother, Yumiko, to be his practice partner. His mother reluctantly agrees to do it only once, after which she is caressed and penetrated until she reaches a continuous climax...