Under The Radar

Mikey always, always told Donnie if he got hurt. If it was a paper cut, the youngest would come sprinting to Don with tears spilling down his cheeks and begging his immediate brother to 'make it stop hurting'. Donatello didn't have a problem with Mikey hiding injuries. He never had to reprimand his little brother for not showing him his battle wounds because, well, Mikey never went off rogue like the two eldest did. And to be quite honest, it was refreshing to the intellectually inclined turtle to not have to worry about his baby brother.
But it was because he wasn't worried about the youngest, Mikey was able to fly under the radar without the purple-banded brother's consent.
Bro fluff! Rated T for mention of blood, but that's all.