Yandere! Puppet x female!reader

(Y/n) is a young girl who loves dolls. She was always fascinated with the way their eyes glowed in the dark, the way their hair felt, and their beautiful porcelain skin. She adored them and everyone personally thought she was odd, well except for her living puppet William. He has loved her ever since he laid his glassy eyes on her. (Y/n) doesn't know that her first doll is alive, and she never noticed it. But what happens when a new boy at school starts to have feelings for her. Will William let it slide? Or will he K I L L just to have (Y/n) all to himself?