Kikonsha Desu kedo, Nani ka?

Mikado – gay, once a famous playboy and womanizer – lost his former brilliance and splendor, having a marriage of convenience. However, Mikado, who has cooled to carnal pleasures, meets a new employee – Serizawa, with whom he slowly falls in love. This guy, obsessed with sports and cleanliness, awakens our protagonist’s wild fantasies and reignites his long-forgotten desire. The mysterious Serizawa, together with Mikado, who is obsessed with him, they go on a business trip and stay for the night at an onsen, where Mikado discovers an unexpected secret about Serizawa …

(Source: Frontier Works, translated)