I love you- I love you is something that Yao hasn't heard in a long time but whenever he hears it from Alfred it just makes him feel so many emotions. Happiness, compassion, comfort and a new emotion that he just can't express or explain. But, he knows that this feeling he has for Alfred is more than friendly or family it's real love and respect for him. So when Alfred tells him that he loves him and that Yao means so much to him Yao jumps into his arms and kisses his lips as a way to express how much he loves him too .