I too am a self-proclaimed masturbationist. This story is quite amusing; I hope you enjoy it!
Chapter 8 from Kouda Tomohiro’s tankoubon “ComeCome Selection” (コメコメSelection); originally published in COMIC AUN 2013-03.
Edit: A reader brought to our attention a minor translation mistake (past tense changed to future tense) on page 95. Here’s a fixed version of the page: [click] (NSFW)
Quality checkers: Cadenza, freudia
[Kouda Tomohiro] Imagine (ComeCome Selection) [English] [Team Koinaka]
[幸田朋弘] イ・マ・ジ・ン (コメコメ Selection) [英訳]