Ui Ui saw you with his older sister, Mei Mei, walking next to you. He felt jealous so he runs towards them and And he squeezed between the two so that he is next to his older sister.

"Hey! Don't be too close with my sister!" Ui Ui yelled at you while you three were walking.

"Haha, it's okay Ui Ui. She/he is just too cute when I'm walking with her/him." Mei Mei tries to calmed him down as she smiles mischievously when she looks at you.