Prince of the Nest Box

Everyone has one or two things they don't want you to know. The secret of Aoyagi, a 29-year-old office worker, is that he is gay. For Aoyagi, who pays his sex friends to fulfill his body, love is like a dream from another dimension. The prince of his heart is Asagiri, a 37-year-old super-elite from the same company. A brief conversation with the prince in the lift in the morning is his daily happiness. And yet! One day, the prince finds out his secret! And what's more, the prince actually has a terrible secret too...?!

(Source: Taiyo Tosho, translated)

Note: Chapter count includes an extra.