Ultraviolet shame
At a goth party, I spotted an old friend standing in the "chill" area, which was lit with black light.

As usual, the light was displaying all the fluff and cigarette ash on all the black clothing and, amusingly to me, the patchiness of my friend's foundation. She is generally a very au naturelle sort of person, so this amused me unreasonably.

Since we're old friends and have a fairly open, rough line of banter between us, I remark that it's funny the things you don't notice in regular light, making pointy gestures at my face.

My friend wore a brittle smile and said something I could not quite hear over the Sisters of Mercy.

Thinking my observation skills unimpeachable, I blathered: "I said I don't think your makeup was intended to be worn under UV!"

She pulled me closer and said calmly into my suddenly burning ear: "I'm not wearing makeup, it's damage from radiation therapy."

"Oh, well, actually that makes it kind of cool in a weird way..." but my quivering shame weakened this rally and she patted me, not unkindly.
(Ladyfingers is in your wardrobe,, Sat 18 Aug 2012, 17:47, 1 reply)

Don't believe it
It was probably cum. That shows up under uv light. She was embarrassed to be caught out not clearing up properly and put you on the back foot.
(K.W.A. Knickers With Attitude, Mon 20 Aug 2012, 14:36, closed)