I need to find this

So, I don't really know what the name of this yaoi manga is, but here it is.
It's about a boy who likes this other boy and he would watch him, when he gets change for gym. His brother knows that he is gay and all, btw.
One day his brother came to his classroom and ask to borrow his dictionary, no one knew that the boy had a brother, so when the boy got called by his first name they were all surprise. Now the boy he like thought that his brother was someone he like and he got jeolous.
That's all I remember!