Should I help them get together (18, F) (17, M) ?

We have known him since we were kids and he dated my sister when he was 13 and EVERYTIME when she walks in, he stares at her and blushes. My sister wears a lot of shorts and skirts and she does work out often. She has a slender frame and she is cute I will admit.

My friend tells me that he has feelings for my sister and she told me she does as well but they want to see what will happen first.

Should I help them get together (18, F) (17, M) ?
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