My gf, who loves having her hair stroked, once came in the hairdressers as the girl massaged her head and stoked and brushed her hair as she lay back eyes closed. Apparently it wasn't a screaming one but a long shudder. The girl asked if she was ok and she just said it was a shiver. She said she was just really relaxed and it came out of nowhere. Anyone else had this?
She said it kind of crept up in her. She did say her panties were very wet though. She often wonders if the girl doing her hair guessed what was happening. Or if it happens offen to others.