Mycroft is sick with flu. Sherlock and john come to take care of him. John has to take his rectal temp, perform a rectal exam, spanking for whining, enemas,all the good stuff and my bulletproof wtf!this-is-a-kink?:cuddling and crying. Just Mycroft being sick and miserable and being comforted and examined. Keeping it in-character with no crack seems impossible but I'd like that.