Perfect Buddy vol. 2 (Yaoi manga)

After seeing firsthand how well-endowed his coworker Baek Youngchan is, Seo Hyunsoo finds himself plagued with the filthiest thoughts imaginable. Clearly the way to rid himself of his insane fantasies is to avoid Youngchan entirely, but Youngchan doesn’t appear to have gotten the memo. No matter where Hyunsoo turns, Youngchan is there, being his annoyingly perky self. When Hyunsoo’s patience runs out and he causes a scene with Youngchan, the two are sent to their shared room to work out their differences…and their mutual attraction becomes undeniable!