Scissor Fire
Two women doing what's known as "scissoring", both either having a burning sensation STD or a UTI -OR- both must be two natural born red heads -OR- used accidentally, or otherwise, a lube causing a burning sensation, while said "scissoring" occurs.
"I was gonna make it a threesome, but I caught wind that their was a scissor fire burning." -OR-" I went to Ireland, expecting to see a scissor fire, but I came back disappointed" -OR-"I knew she was kinky, but I didn't expect her to turn it into a scissor fire."