Harriet Potter and the Goblin Bet

HP AU- (Some elements from Goblin Slayer series)Due to a mishap in a raid against remnants of Dark Wizards seeking revenge for Voldemort, Harriet Potter the famed Auror and prime-bodied thrillseeker became entrapped in a last-ditch effort to get rid of her using a portal to the next world. Ancient runes and eldritch fueled by the sacrifice of a cultist leader brought Harriet into the depths of a new world, landing right into the midst of a cavernous civilization full of rape-happy Goblins eying her like a delicious peice of meat. Inspired by her tenacity for defiance as well as her fiery spirit in refusing to give herself to him, the Goblin Lord ruling the Cavern Goblins makes a wager with Harriet to see if she can outlast him. If she wins and wears him out before she tires, she's free to leave, but if the Goblin Lord makes Harriet pass out, she's stuck there for another month until she can challenge him again, leaving her to be freely ravaged by numerous Goblins all wanting her to give birth to many Goblin babies.Who is an adrenaline junkie like Harriet to refuse such a request? She takes it and its more than she barganed for.