Wayward Wings (слэш)

As he straightened up, his wing jerked, and Eren stiffened as he felt it smack into something—or rather, someone.
“I’m so sorry!” he burst out, but as he whirled around, his wings gave another spasm and hit Corporal Levi in the face. Again. “Sorry!”
He held his wings stiff against his back, though he could feel them straining to move, as he stared at Corporal Levi.
Corporal Levi, whose face and hair were now half-covered in mud. Corporal Levi, whose expression hadn’t changed but who was more likely than not livid. Oh, crap.