In my dream I see myself having sex with my sister which I do not like. I feel very guilty when I see this type of dream so please help me out why I see this type of dream. And what does this dream means.

Answered according to Hanafi Fiqh by Darulifta-Deoband.com
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بسم الله الرحمن الرحيم

(Fatwa: 1587/1236/B=11/1434)

The dream indicates that your sister shall gain any religious and financial benefit from you. You should recite اعوذ بالله بسم الله and then four Quls (سورۃ الکافرون، سورۃ الاخلاص، سورۃ الفلق، سورۃ الناس) and blow on your palms and pass them over your body as long as it reaches. Do it thrice. Then recite Ayatul Kursi and go to sleep. Also recite the following dua:
رب اعوذبك من ھمزات الشياطين واعوذبك من أن يحضرون.

Allah knows Best!

Darul Ifta,
Darul Uloom Deoband