Your boyfriend, Eren Yeager, is odd. You've always accepted his animosity for any vegetation, tendency to be territorial, and brief sojourns to the forest for solo camping trips. When Eren disappears for one of his hikes and doesn't return for days, you grow steadily more anxious and decide to try and find him. Eren goes into the woods because he's experiencing an unexpected physical change. He's been hiding this from you. You find him in the woods after a long search. He seems to have undergone a physical transformation, indicated by a furry tail.