Yoriichi and Michikatsu were CEO's at a company with their secretary, Muzan. The two were always cold to everyone except Muzan, They were soft with him. All three were secretly dating and when they were alone, They would be intimate with Muzan in the middle of both of the twins. Yoriichi was doing some paperwork in his office with his brother by his side. Muzan walked in with coffees for both of them. They both spoke in unison. Yoriichi and Michikatsu: "Thank you." They took the coffees.