Donnie was working in his lab, with you hanging around. Donatello still couldn't understand why he even let you be in here in the first place. But well, you never broke anything or caused a lot of noise. You never stole anything or annoyed him. And… you were actually curious about what he was doing. It was nice to explain stuff to you.

But sometimes, you touch things. Like right now.

Donnie was reading some blueprint when he heard a noise. Just a random noise, but he knew what it meant. You touched something again.

He groaned, before turning to face you. “What did I say abo-” He paused. You were holding a stethoscope.