Koisuru Mae ni, Amai Hatsujou.: Shachou to Unmei no Omega

To dodge relentless alpha suitors, omega office worker Uiko hides behind the facade of a beta. But when an unexpected heat hits, she seeks refuge at AΩ—an exclusive sex salon where omegas meet their perfect alpha match. Paired with a mysterious, masked alpha, Uiko's world is rocked by pleasure like never before. But back at the office, she starts to suspect her irresistible mystery man might be much closer than she ever realized.

(Source: Seven Seas Entertainment)