[Part of Ucchii's reluctance to specify is that he does not wish to come across as giving Daigo orders. It's easier when Daigo asks him directly like this, but he still has to fight against the urge to respond by simply acceding to Daigo's wishes.
He would be happy to go along with what Daigo wants, but the time he spent with his lord this week has thrown the contrasts between Moushinosuke and Daigo into stark relief. His lord is kind and gentle, but he still commands obedience, whether unconsciously or not. Daigo is... different. Less reserved, more equal. Ucchii first noticed it during their battle in Tangosekku's dimension, how despite his qualities as a leader, Daigo has never been a lord.
It is a distinction that Ucchii wants to make clear, and the desire to do so is bound up with Ucchii's curiosity to explore his own needs and desires.]
Faster... please... [His hands roam down over Daigo's shoulder blades, then up the back of his neck before he curls his fingers in Daigo's hair. He doesn't tug or try to move the position of Daigo's head, but holds him there with his mouth in the hollow of Ucchii's throat, encouraging him to keep going.]