Adult manga, a guy and several girls locked into a room and testing horniness drugs

[Jamming10001]

I can't remember the title and Googling keywords isn't helping at all. A guy and several girls volunteer for some experiment where they test drugs that make them horny, they have to stay in the multi-bedroom apartment for several days, it turns out each of them know the guy from their past and there's some mysterious storyline going on behind the scenes.

 

[KATCRX]

Desuraba / Destiny Lovers

 

[Jamming10001]

Desuraba / Destiny Lovers

Nope, that's not it. The one I'm thinking of doesn't have any kidnapping. People volunteer for like a clinical drug trial. I can't remember the level of explicitness, can't remember if it was straight hentai or just erotica. The one you mention looks interesting though, but it's weird that there are two mangas by the same author on MD with the same premise, but they're different.

 

[Jamming10001]

Did some more searching and found a reddit post where someone remembered even more details than I did, and they got an answer:
Under Observation: My First Loves And I

 

[TestAddress]

any n' tie.