The Demon Dungeon Harem

I pick up a choose your own adventure book in a second hand bookshop. This is just like old times, the only stats are skill, stamina and luck and all I need are some dice.
What the old man who sold me the book didn't tell me however, was that as soon as I opened the book, I would be transported into its world...
A 7000 word litrpg short story featuring explicit scenes. Adults only.