Kaede and Sumire meet for the first time at a family reunion of their black, muscled brand-new boyfriends: the brothers Bob and Michael Wild! Sumires eager for them all to get closer, so what better way than how Bob and Michael snared them to begin with?T

I hear my beloved wife's moans through the sliding door as she's having sex with her affair. Meanwhile, I'm also having sex with my friend's wife and letting out my sperms...Summary from INKR Comics. Official English

Ch. 1:

One couple; Oono Susa is a lover of novels and his girlfriend Amane Hatsune is a lover of manga. Another couple; Konohana Sakuya is a great cartoonist while his girlfriend Ebisu Miko is a cosplay goddess. These two otaku couples attend the same university

Original WebtoonOfficial Translations:Japanese