It was easy to end up nose-to-nose when your snout started lengthening like this...
He'd discovered the necklace in some desolate attic corner years ago and kept its unique properties to himself for a bit. When his girlfriend found out about it, she couldn't stop thinking about it, kept hinting at using it to spice up their love life. The transformation lasted a good hour, so they each just had to slip it on briefly, and they could have some fun...but how could she have known that carnal relations made the effect permanent?