Synthetic Love [v1.1.0] [Kexboy]

Biochemist Victor (the inventor of the serum) and three girls go to the isolated private residence high in the mountains. They work, they rest and make experiments there. The serum has an impressive effect – your sex satisfaction becomes incredible. But there’s one unpleasant side effect – partial memory loss. A person forgets everything since the moment he gets the injection till the moment he wakes up next morning. But this serum testing is only a context of our main story.

Thanks @UncleVT