Tbh I think he keeps the tattoo and did those other things because he feels like that was the only way to be family with his Uncle. Not necessarily that he felt an attraction to him. Idk
My thoughts also, I feel like what he really wants is a person to call a family and it's really prominent with his thoughts on the chapter 8 where he realizes that what he and "his uncle/perpetrator" is not a relationship that you would call a family but it probably got mixed up in his young mind adding to the fact that his uncle was actually his late mother spouse aka his step father (ickk). And he said it himself, the warmth and the feeling he felt when he was with the uke is the one that you would call a family. Though it's really disheartening to see his background story, I mean no child should experience that, and I hope someday he will find a new meaning to his tattoo or entirely get rid of it (which I prefer tbh since the reason behind it is very disturbing)
Totaly agree, at least change it in something new. But I think another reason he cant erase it is that one thought "this is my first free choise [to keep the tattoo]". That carries such a deep meaning even if it was a really quick pannel. That choise is defining a turn over in his life when he suddenly take control over it. So the tattoo is a the same time an anchor to a (quite dsrk) past showing the abuse, and the demonstration he put an end of it. That's why, deeply he cant erase it, or he would cancel his first moment of affirmation.
Chouno’s backstory is too disturbing, I don’t understand why would he want to keep the tattoo (it’s a cute tattoo but it was forced on him, so it completely changes the meaning of it), I wonder if he still doesn’t realize it was an abuse and sexual violence towards him not just “the only way uncle knew how to love him”