Shawn: Dark Instructions
After everything Shawn had just experienced, he felt a certain, possibly irrational (but not really) fear that Mr. Clayton sleeping in his bed would be the start of a slippery slope where Mr. Clayton would end up living Shawn's whole life, while Shawn would be relegated to the case like the dummy he was. But he didn't want to just outright refuse him, in case it made Mr. Clayton mad. "I'll think about it, but you'd have to something really nice for me in return." Maybe if he asked for something big enough, Mr. Clayton would refuse and that would be the end of that.