well its like a guy who's leg was broken or sprained because he was boxing
and theres like a guy whos helping him hes like blonde and has tattoos on his chest
it has uh 18+ scenes can anyone help?

You might have better luck asking in this thread: https://dynasty-scans.com/forum/topics/11660-what-s-that-manga-called
That being said, do you know where you read it? There isn't exactly a lot of Yaoi on this site.