The geek, (brother of brunete woman) be talk with a friend of your sister. During the talk, they showed interest one for the other. 聼起來自然嗎?

I see two places in here that need a little change. First is the phrase in the parenthesis, be sure to use “the” when you are referring to a noun with a specific meaning; it should be “(brother of the brunette woman)”. Also there is in extra t in brunette. And the last little mistake is after the parenthesis, it should be “was talking with a friend of your sister” because this occasion is in the past. Hope this helps!