Boss wants his money back in otherway?

By gender I am a male 26. My problem is I am working in a firm who r having only three employees. The other two r old age. My boss is also of age 52. He once helped me financial for my elder brother's medical problem.But now my boss wants me to become his wife in secrecy, as he is topper.He wants to take me to some hill station for honeymoon for fifteen days now.He even purchased female dresses like saree,salwar-kameez, nightie for me & even some ornaments & some make-up kit etc too.He wants me to dress up fully in female attire like newly married bride & shld go with him for honeymoon.Whaen i firstly refused for his plan, he conditioned me either I shld give his money back at once or I shld serve him as his wife.He is a widower.But I can't return his money within ten to fifteen yrs also,bcos amount is heavy.He says only being his financial help my brother is alive, so I shld please him as he wants .What shld I do?