Sakaki the Lazybones Shows His Talents at Night

Our heroine works at a lifestyle goods company and is the only person in her department who treats her lazy and socially awkward coworker Sakaki with any niceties. One night after a big work party, Sakaki takes her home and then he forces himself on her. Unable to get it out of her mind, she heads to work the next day. While working, a worried coworker touches her waist and Sakaki is having none of it. He goes over to the heroine's house after work, to have a talk. But no sooner than later are the two in bed with him tying her hands up.

(Source: viviON, translated)