Long experience as a creative writer in English (have no Hindi). Included in this is some more mature content. For practice, I have written stories along the lines you want before and they generally were well liked.
I have also worked as a ghost writer on many stories involving strong characters, including in a sexual sense.
With my skills and experience, I am sure I can do your project justice.
My price is negotiable, within limits, and I would prefer to agree on a story and word count and agree on a price for that, rather than keeping track on how many hours I work on it.