There is this adorable fan fiction "Scout and the SpyCrab" written by Crystal124 that is well written and enjoyable.
The blue spy turn into a spy crab and red scout is his only hope to ever becoming human again.
It is like The princess and the frog expect this is not RatedG and it is team fortress style :] Hopefully She/he will finish it soon. :]
I doodle some stuff and put this together for you guys to enjoy
Crystal124: Scout and the SpyCrab-[link]