Nightingale's Oath Episode 20

When Kotoko announces to Irie that during the capping ceremony/graduation all the male students in the medical department are to present flowers to the nurses they like, he tells Kotoko that he won't be able to make it to the ceremony because of a meeting and that the whole flower giving idea was stupid. Then Kotoko is selected as the representative for her class and has to recite the Nightingale Pledge because she is Irie's wife and because nobody except Moto volunteered but since the head nurse knows that Moto is a male and the tradition was to have female nurses to recite the Pledge, he wasn't selected. Afterwards, Kotoko practices memorizing the Pledge but has trouble when Moto walks by reciting the entire Pledge perfectly. At that moment, Kotoko realizes that Moto really did want to be a female nurse because...