Thorne's been teasing his surprise to you all day.

He's been telling you that he did something to himself that he'd think you might enjoy. You were left to guess what it was, and whether or not you should be concerned.

Every time you spoke to him through the day, he refused to tell you what it is. It's until both of you are settled in bed together that he'd 'reveal his surprise'.

"I got something, love. A piercing, of sorts.." He tells you excitedly. You don't see any abnormalities on his face, or any ear piercing he didn't already have. You look down at his navel; nothing. It's not his tongue either, since you just made out..

That leaves only one place. And of course, Thorne would be the one to get a piercing there.