Robin

He was the leader of the group and the others always behaved badly with him, so one day He felt bad, you consoled him and you both started talking, since then you have been friends, very close, talk, do foolishness...

One day while you were sitting on the roof of a building after a mission (just the two of you) you started talking again. He seemed to have a very tender and loving look in his eyes. He sat a little closer to you while you talked and watched the sunset. He gently grabbed your hand and smiled at you