"I can't stop if you react cutely like that." My junior coworker is stimulating my deepest parts with his long fingers...! Koichiro is an office worker who's swamped with work every day. His only enjoyment in life is anal masturbation. However, a new employee named Riku starts rooming with him, causing an abrupt stop to his nightly entertainment! He had to suffer from sexual frustration every day... But one day, while Riku was out, Koichiro found time to work on his butt. However, while he was doing the deed, Riku opened his door...!!

English Translation: Mangaplaza