Guide me how to cuck my Fiance?

Saqib

Male
Hi Everyone! I am from Pakistan and I am a Muslim 26 year old male.
My fiance is 18 year old very beautiful and young. We both loves each other so much. I really have a fantasy to cuck her.
But i don't know how to talk with her that because maybe it spoils our relation as she is very innocent and only loves me truly. Please guide me I have a strong feeling of cuckold.