Choose Only Me! 

Wataru and Ayumu are the office's heartthrobs, charming and successful. On weekends, however, they trade their suits for sweats and dive into video game marathons. Ayumu, secretly head over heels for Wataru, has perfected the art of playing best friend, even swatting away potential rivals to keep his spot. But when a client offers to set Wataru up with his daughter, Ayumu's carefully laid plans begin to fall apart... (Source: Takeshobo, translated and edited) Note: Includes one extra chapter.