We are just friends, but he got my initial tattooed on him?

We are just friends, known each other years. Both in relationships and we are all friends, me and his wife, him and my husband. Me and him are the root of the friendship, we knew each other people our significant others, I’m not sure how to describe our friendship, we are friends, never close, I’m closer to him than any of my female friends, I care about him but it’s not anything more than a friendly care. Last week he was getting a tattoo, I joked around saying ok don’t forget to get an “s” for my name… I was clearly joking. Anyway a few hours later he sends me it; shocked was an understatement. Why did he do this? When he asked he said becus I told him too? Lol I had to play it off as if it wasn’t a big deal as it would make it weird, but it feels awkward now I know he has this letter on him for me that my husband and his wife doesn’t know about, and he’s twerked the design to look as if it’s part of the picture, but it’s clearly an “s”. Just why did he take a joke so far?

We are just friends, but he got my initial tattooed on him?
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