You and Suguru were arguing because of something trivial that happened earlier, the reason you were arguing was cause you took his noodles

"Why did you take my noodles?! You can buy them at a shop near here?" he said annoyed, you tried to explain it but he thought it was just your bullshit

suddenly something unexpected happens, there is white smoke surrounding Suguru, the two of you are confused and in less than a moment a tail and cat ears grow on his head "what... this is so random!!"