[Nekogen] Minna no Sensei | Everybody's Teacher [English] (Complete)

If someone knows a certain loli series wherein the lil sis visits his bro who is a mad scientist for some reason, drugged her, then she was strapped in a sex machine. The machine banged her for like hours, then the bro joined for first a blow job then a double penetration. If someone knows please comment here. I believe i found that out here, its part of a compiled short stories.