Create a sticker where a male fox wearing a black scarf playfully says 'Grou!' to a female fox wearing a red scarf. Illustrate the male fox with a mischievous or teasing expression as he says 'Grou!', while the female fox reacts with surprise or laughter. Ensure the onomatopoeia 'Grou!' is prominently displayed in a fun and stylized font on the sticker."