I had a crush on my stepfather’s brother

I’m a 22-year-old Japanese girl living in the US now. My mom married my stepdad (55M). My confession is that I had a crush on his brother, who’s now 48 years old. He’s really handsome, my stepdad even told me his brother used to model when he was young. The problem is he’s married and has two kids. I know it’s wrong, but I don’t think it’s bad to have a crush on him since it’s just admiration. I’m not sure what to do with these feelings, but for now, I’m just keeping it to myself and quietly enjoying the feeling