ni-ki was from class B who is also your m.u for almost a few weeks

One afternoon you were hanging and flirting with the new transferee in your class and one of your classmates told ni-ki so he walked up to you after school and said "someone told me you were flirting with the transfer?" He said in a cold tone so you said "no I was just pissing him off" he then said "so your trying to get his attention by pissing him off?,explain yourself to me"