Recently, Reno's husband has been busy with work, and they no longer have sex. However, Reno's mother-in-law is pressuring her to quickly give birth to a grandchild for her. In order to make it easier for Reno to get pregnant, her mother-in-law has asked her to abstain from sex for a month, after which the couple can unleash all their desires on a hot spring trip with the family next month. For the past month, Reno has had to restrain herself, even refraining from masturbation. Finally, on the day of the family trip, Reno can no longer bear it; she just wants to quickly have sex with her husband, but he adamantly refuses. Reno's father-in-law, although old, is still very virile, but his wife has long denied him physical intimacy. Passing by the hot spring bath, witnessing Reno's beautiful naked body, he loses his rationality. He rushes to embrace his beautiful daughter-in-law, releasing all the pent-up sperm deep into her womb! Initially resisting, but after being soothed by her father-in-law, and experiencing pleasure that her husband could never provide, Reno becomes more proactive, inviting her father-in-law, actively asking him to ejaculate deep inside her! A few months later, Reno's husband is overjoyed to be a father soon, but Reno knows that the child in her womb is not his...