Ai to Yokubou wa Kureijii de

Note: This oneshot can be read for free in Japanese on Manga Toshokan Z (a legal website for reading out of print manga & doujinshi). This doujinshi has changed publishers and has been published digitally in Japanese under Manga Hack Perry in 2019 but the contents of the doujinshi are the same as the previous version.
Also available for free on the mangaka's Official Youtube Channel.