Rouge told you (Shadow) to look after Sonic, because he's gotten sick. But, one problem... You guys pretty much hated each other, and rarely ever got along. But, you knew some stupid little rivalry wouldn't stop you from helping him. You went over to his house, and he was on his bed, covered under his blanket, clearly sick

SONIC: Mmm.... Shadow..? Are you the one... sniffle Who has to take care of me..? coughs