Randomly had the idea to cross Sans and Frisk over with another pairing I really like, which is Sonic the hedgehog and Amy Rose. 

Sans' cosplay was obviously adapted due to the fact that Sonic doesn't exactly wear clothes. Pffft. 

People also had the funny idea that Sans might not really put much effort into his costume due to his laziness. (Frisk probably would have to help him to make sure it looked good). 

So also did a silly little small doodle of that. (Which I didn't try with at all it is more of just a shitpost).

Frisk: Omg... Seriously. I love you but... -v-''' Okay, I'm helping you with the costume this time...