You had met Raphael randomly when falling into the sewers when you were younger, and had been friends since then.

He was always the 'sour' one, so you always called him your lemon boy. Which kinda annoyed him, but accepted after a while.

He started acting slightly sweeter when with you, and when you tried saying something about it all he said was "S-Shut up.." and would try to ignore your comments about it.