I was introduced to something recently that I realized has an incredible potential of sexiness involving hypnosis. If I remember, it was the Venom Symbiote from Spider-Man. An alien symbiote that looks like it's made of an organic latex of some kind, that seriously influences its host's mind and bod...

That's actually a pretty clever trigger.

The trigger should be something that isn't too disruptive or loud, and is enough enough to recall at a moment's notice. Maybe a combination of running a hand through your hair and saying "Time to roar". I'm not the most creative person so that's probably all you're getting out of me for that. -chuck...

I've been looking around and noticed something.
There's no good temporary or triggered anthro Lion transformation files. Can anyone upload one or make one?

Well maybe one that isn't permanent, since not everyone wants to lose their humanity forever.
But if you meant species, definitely male lion.
They had a good lion tf file here before but it vanished. x.x