https://www.dlsite.com/maniax/work/=/product_id/RJ01216302
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_406349
Includes hairy and hairless versions.

bro，你真有這本事，來榨你的人絕對不會是美女

Base +6

[Synopsis]

In a world where the declining birthrate has worsened, the more vital sperm, the more popular you are.
Hoping to turn his life around, our protagonist, "Sakimen-Jyuu-Otoko," purchases a government-approved sperm testing kit.
While he waits for the results, he receives a call from the laboratory saying, "We've found an abnormality in your sperm and would like to explain it to you in person."
Later, Rika Tamaki, who works at the laboratory, tells him that his sperm may have rejuvenating properties!
She demands a sample of his sperm and in return he demands sex.
He ends up ejaculating inside her during sex, leading to a shocking outcome...!

Base +28

Great plot for AR. But, she's supposed to get younger multiple times here? She barely look any different from start to finish even though the light thing happen four times! What a shame.

Base +8