Have you fell in love with your sister-in-law's sister?

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I currently moved from the province to find a greener pasture in the city. I lived with my brother who is married and with him lives the beautiful sister of his wife. Everyday I see her preparing things to work. I look at her beautiful face and her sweet smile. I really feel better if I see her laugh. I had a crush on her. I would think about her everyday, every hour and every minute, but what can I do? It is wrong to fall in love with her, she is already part of the family, that would be taboo right? but my heart keeps beating for her. Tell me guys, have you ever experienced that situation before? And what would you do If you are in my place?