Some would say everyday must be Halloween at Passional, the exotic/erotic off-South Street boutique catering to all manner of costume frippery, sex play and gender-fuck fun. But if they say it with a sneer, bend 'em over and I keed.

Halloween does suit proprietor Kali Morgan's shop nicely. She can sell out of assless leather chaps and those hand-painted devil horn barrettes she has in the front of her store — the "PG-rated" section parents can feel safe to bring their kids to while they shop for bondage gear. But in the back gallery, since the beginning of September, Passional's played host to Custom Vampire Fangs While You Wait Saturdays (704 S. Fifth St., 3-10 p.m.).

People with fangs ain't new: Patrick Rodgers' Dracula's Ball at Shampoo on Halloween'll be stuffed with permanently pointy (essentially filed-down) toofers. But what if your commitment to nasty gnashers isn't quite fixed toward forever?

"I've had fang guys who took molds and measurements and delivered them to clients later," says Morgan, as a grey rain pours outside. "But "Wraith' [he doesn't want his real name used] found me at a Libertine's Ball and sold me pretty quickly. He made me three different sets that snap on-and-off easily — and they're totally functional. I was chomping on people all last night."

You wouldn't eat an apple with them. But lo mein, sure.

The tall, blond Wraith, a formidable 30-year-old FX/costume artist with his own 8-year-old company (Bump in the Night Creations, www.BITNcreations.com) uses uncured dental acrylic that he molds around your teeth; this he will sand, shine, shave, sharpen, buff and polish to desired effect. There's long-sized werewolf sets ("better for leaving more marks," says Morgan) and average everyday vampire teeth from one-half to seven-eighths of an inch long.

The setup is fairly simple: just a mixing tray and a teapot for heating the molding. Katie DeJoseph, a brown-haired, 22-year-old Web designer/fetish night occasion-er is getting fangs: "basic vampires" for her first time.

"They're cool and subtle," says DeJoseph. "I might wear them daily. So I wanted them to look natural." She may get permanents, but these are a test.

Wraith does good biz, averaging five to 10 sets a week (fangs start at $60 with discounts for multiple sets). But these weeks have been so good — customers two deep as we chat — that Morgan is keeping him on for foreseeable Saturdays.

Some people want outlandish teeth for outlandish requests. "To be perfectly honest, I don't ask for everyone's life story," says Wraith. He's not a hairdresser; he makes fangs. "I'm not one to pry. But you can tell that not everyone who sits for fangs is of the life."