How do I tell my friend I have a crush on your brother?

I have known my female friend for one year.

We went to a festival together along with her brother.

He made a lot of effort to speak with me and advised me that he was single. He touched my face when I was dancing.

I noticed my friend watching us a few times.

Nothing happened, I was just friendly at responding to him.

I adore her brother. Everytime he spoke, I just found him to be so desirable.

I thought he might tell his sister about me. I have not heard anything. It has only been few days.

What should I do?

How do I tell my friend I have a crush on your brother?
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