Dog Days of Summer (QCP: BJ-Eps05)
"it is possible for us to arrange for a transformation trigger chemical to be injected into lance that would enable him to switch back to his human form, although his time as a human would be limited and he would shift back into his new cano-sapien mutant
Toonium City Arrival (Gerard Prince rewrite, Eps 1)
"to change back, simply activate the transformation trigger again. you will revert to normal. i am sorry you both ended up with this formula. redears won't stop until he gets it." arnie grinned.
Dream On
Because the transformation triggers all the nerves in the area where it happens, but it cannot hurt his body so it doesn't send any pain signals- so it triggers a pleasure response.
Donkey Jobs and Party Packs (Gerard Prince rewrite, Eps 6)
"if the boy is lucky, he may have a transformation trigger like gerard and arnie do. with something like that, his winged unicorn form could become his secondary form. and if he doesn't have a trigger, we can have one installed.
Humanity Displaced
The transformation triggers all pleasure nerves in the genitalia when they are turned, which causes unwanted arousal and often results in spontaneous sex, but ironically the animals are less likely to start fucking as a result than the humans are.