In this fanfiction, Naruto's chakra could be compared to the energy or 'aura' in the Monster Hunter world. He might use his shadow clone jutsu to surround and confuse a large and dangerous monster. As for the 'lemon' part, it could involve a love triangle between Naruto, a local Monster Hunter girl, and a male rival hunter. Their relationships could be explored while they are out in the wild facing deadly beasts.
One possible story could be that Naruto finds himself in the world of Monster Hunter. With his ninja skills, he might approach hunting monsters in a unique way. The 'lemon' aspect could imply some romantic or spicy undertones. For example, Naruto could form a bond with a female hunter, and there could be some flirtatious exchanges during their monster - hunting quests.