"Hibiki and Koushiro, high school sweethearts turned longtime partners, have lived together for 10 years. Despite their deep love, they struggle with the reality of being beta—unable to be a "fated pair" like other couples. Their inability to express affection openly weighs on them, and small insecurities build over time. Can their love withstand the quiet challenges of societal expectations and their own doubts?"
Living together Omegaverse. Bittersweet but suuuch a good read.
Kimi to Unmei ni Tsuite no Hanashi ga Shitai