My brother confessed to me that he would like to try on women's clothes, make-up, and heels, what should I do?

My parents went on vacation and me and my brother stayed home. We are of course old enough to stay alone, I am 22 years old and my brother is 18 years old.

He told me he would like to try on women's clothes, makeup, heels etc. He asked me not to tell our parents about it. Honestly, I didn't really know what to answer and that surprised me a little because my brother is quite masculine and not at all feminine.

I don't mind, but what should I do, should I let him do it and not tell our parents?
My brother confessed to me that he would like to try on womens clothes, make-up, and heels, what should I do?
My brother confessed to me that he would like to try on women's clothes, make-up, and heels, what should I do?
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