GAPS: off limits 

“Let's go buy a ring.” Naoyuki Hasegawa, 37 years old. He has lived a normal, serious life, until he finally became lovers with his subordinate, Katagiri. Satoshi Katagiri, 30 years old. He is handsome, intelligent, and has a good personality. He is admired by both men and women as the prince of the company. But in reality, he is a playboy with questionable morals who lacks conscience. Yet, he is unwavering devoted to only Naoyuki. They were supposed to live a sweet life as lovers… but Katagiri's college senpai, Nakamura, suddenly appears!? (Source: Taiyo Tosho, translated) Note: Includes one extra chapter.