Hey, do you know? The lifespan of love is three years. Then how about the lifespan of casual sex? Shall I teach you? 
When Shizuma, recently dumped by his girlfriend, wakes up next to Minato but claims to not remember a thing about their night together, Minato becomes offended and plans to "seduce and dump" the straight guy. But his revenge doesn't go as smoothly as planned, because it's not just Shizuma who ends up falling... 
A spin-off of Secret XXX featuring Shouhei's older brother Shizuma and Mito's younger brother Minato.

1. XXX Allergy 
Growing up in an environment full of all kinds of animals, there’s only one animal that Shouhei loves and that’s rabbits. Because of his love for rabbits, he sometimes helps out in a rabbit specialist shop. And there, he meets Mito Itsuki, his unrequited love. However, he has a secret he has to keep no matter what. Would he be able to keep that secret in order to stay close to the one he loves…?! A cute and short love story by Hinohara Meguru. 
2-3. Secret XXX 
After going through many hardships, Mito and Shouhei finally became lovers. Just when their love is starting to bloom, Mito begins to act strange for some reason. Shouhei still doesn't know much about Mito so he can only sense Mito is hiding something from him. One day, Shouhei saw Mito with another guy in his car?! What could Mito be hiding? Can Shouhei keep his faith in Mito. 
4-5. Relation XXX 
Included extra story: Happily Ever After

The continuation of Minato and Shizuma's story, this time as an established couple! 
 
Shizuma just started working at a new place and their time to meet each other after work is getting less and less. Perhaps a good solution is starting to live together...?

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