
Desperate couples head to a secret, unapproved retreat as their last hope to start a family. Realizing that biological compatibility is the key to conception, they engage in an intense swapping experiment to maximize pregnancy odds. It's time to find out whose seed truly works.




















First, they start with their official partners. Then, the wives pose naked in suggestive positions โ the red and yellow couples have sex with their partners โ the blue couple has sex โ and from there, it turns into swapping. The yellow wife with the teacher โ then the red and blue couples swapping with the teacher. Overall, it just lacks that erotic punch.
It felt great up until the middle, and just imagining what would happen next was exciting, but... why did one couple just leave at the end? And if they're swapping in the same room, why didn't it turn into an orgy? Such a letdown! Sasaki-san is a master of erotic kissing, as expected.
The concept of swapping and getting pregnant with someone else's child during the fertile window is good, but... 1. I wish they'd cast more attractive actresses. 2. Wouldn't it have been better to just stick to a full-on orgy swap? 3. I want to see the husband character get excited and get intimate with his wife after having his wife stolen and stealing someone else's. 4. Above all, a creampie is meaningless unless it's the real deal. Is it really that hard to meet the true needs of the users...?