Reid helps work his own case

Hello! I'm glad to see this community is still here. I've been looking for a fix where Reid was abducted by an unsub who used a broken down car as a ruse. He kept his victims for a weekend, controlled them with shock collars, raped them, tattooed them and then let them go.

Eventually the team is working the case without knowing that Reid is one of the victims. Reid ends up searching the unsubs house and they find tapes of all the victims. He reveals the tattoo to Morgan.

Anyone have any idea what this is? Thanks!