@You said it's your last chapter 30 minutes ago 🙂 Basically, the tattoo artist made that sketch specifically for HIM Yk, he made it while thinking of him, made it for him to wear on his skin for the rest of his life. But instead of tattooing it on him he tattooed it on a random(?) guy.. He took the tattoo he made for HIM, Yk, his bang buddy he has a crush on, and tattooed it on another man.. if you still don't understand, that's like you telling someone you know likes you that you're gonna give them something special and important for them you got specifically for them then giving it to someone else
@I love cutecore i interpreted this as the tattoo the guy sketched after they went to bed, was his first tattoo, which he had already done on his mentor previously. Meaning that even after they went to bed, the guy was thinking of his mentor and his tattoo inside of glasses guy.