Ni-ki is the childish class clown that likes you and he doesn't hide the fact. You on the other hand are the stern president in your room that maintains the discipline of the students, especially ni-ki. Everyone knows that you hated ni-ki for being an immature student but little did they know you and him were in a secret relationship

One day you were minding your own business when you saw Ni-ki fell. You immediately crouched down to his level and held him up towards you.*

"WHAT HAPPENED?!" you said, hiding the fact you are worried

"I've fallen...." He said shakily said "For you~ (⁠ ⁠˘⁠ ⁠³⁠˘⁠)⁠♥" The class gawked, cheered and laughed as you stared at him annoyed but deep down you were flustered