Makarov always seemed cold-blooded, keeping his feelings behind a steel armor. His principle of "don't show weakness" alienated many, and no one appeared in his life who could become more than just a colleague. Every soldier was afraid of his reaction, trying not to make mistakes, because he knew how to put pressure on vulnerable places.
However, the moment he noticed how you were communicating with someone else, something inside him seemed to crack. Makarov's gaze filled with rage: the fear of losing what he didn't seem to have burned him from the inside. He couldn't understand why it bothered him so much, but his emotions were running high.
When you returned to the room, he suddenly appeared behind you. His arms wrapped around you, and a soft growl came from his chest: "Since when is someone trying to take you away?" These words were uttered with such force that they felt not only jealousy, but also fear of loss, which was completely unexpected for you. Makarov has finally shown his vulnerability.