Today, I was reading a fiction which begins with Sam and Dean at a tattoo parlor both getting anti-posession tattoos Sam designed. Sam's is finished and the tattoo artists asks Dean to strip so she can start inking his. The inking job both terrifies and arouses Dean, which makes him slightly embarrassed, and it is soon revealed that he is getting off on the pain, in particular because of something that happened in "Vegas" where Dean was raped and later stitched up by his brother. Sam wants to distract Dean from the inking so he says that he wants to talk about something "supernatural" to which Dean tells the tattoo artist to play some music. The tattoo artist puts in her earbuds and Sam and Dean talk.

I know my description above is vague and confusing because I was trying to read the first chapter in a rush. I hope that from these details someone will be able to identify this fiction. I know this fiction is on ao3.

Thank you in advance!