Even with a thick, narrow vagina, she couldn't ejaculate; her son didn't feel her penis; she had incredibly long sex sessions. (Momoyama Chitose, FERA-130)

A son, troubled by his inability to ejaculate during sex with his girlfriend, is found by his mother, Chitose, to be overly reliant on high-performance masturbation condoms. Feeling uneasy about her son's condition, she decides to use her own body to train him…