[Onizuka Naoshi] Life Is Peachy? [English]

This was one of the first lolicon mangas I read. The first story was so good.

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.