Synthetic emotions brought about by deep lust for an individual. Often the product of being "in like" with someone.
Lustion is a temporary state and can go either way - given time, it could dwindle to nothing or burn into true emotions.
"Ahh, Claudia is so hot, I've got some crazy Lustions for her right now. I hope she calls me back."
"I can't tell if it's actual feelings or just lustions..."