Image imported from derpibooru 
Original Description:
 
Ratchet took a nap and during his heavy sleep, Sideswipe came on over and drew on his face, including makeup and marker, giving him a mustache and a goatee, but also giving him eye shadow and blush and a stamp. He stays hidden in Ratchet’s room during the nap. And then, Ratchet woke up, noticing something was wrong and takes a look in the mirror, immediately he gets upset at what he’s seeing. Sideswipe smirks and with everything he had, he sneaks out, but Ratchet could see him from the reflection and is caught redhanded. This is a normal occurrence here, Sunstreaker sometimes participates but he was gone right now.