She also chose to tattoo a little heart and the "xoxo" on her ring finger - suggesting the pair are set to get married in the near future.
"Next they will be blacked out cause it never last forever and always when you have to get it tattooed to try to prove something," another agreed.
The first picture showed her initials on the inside of his hand, alongside the numbers "69" and "666", with "xoxo" written underneath.
"I almost feel bad for posting because of how much regret they’ll feel in the future," the person who shared the snaps revealed.
Tattoos done on a whim are far more likely to lead to regret than a tattoo you thought long and hard about.