I absolutely cannot let my wife know that I've gotten my mother-in-law pregnant... During a two-day, one-night hot spring trip, I was so engrossed in ejaculating inside her that I kept doing it. (Marina Hyakuno JUR-474)

"Kenichi-kun, wouldn't it be nice to see my grandson's face?" My mother-in-law's words left me unable to hide my unease. What should have been a joyful family trip to the hot springs turned into a demand that I use the opportunity to have a child with my wife… Obeying my mother-in-law's wishes, after a month of abstinence, the day of our hot spring trip arrived, only to be met with my wife's refusal to have the baby. To alleviate my gloom, while wandering around the hotel, I happened to witness my mother-in-law bathing…