AI help me narrate nsfw role?

Hello, I'm a dungen master and a novice writer. The topic of this post is to ask for help with my roleplay narration, which I initially started with gpt chat, but let's say things got very… spicy… the thing is that now I need something to help me narrate +18 scenes with NPCs and that are also explicit enough, and with gpt chat I only get the same response of "I can't do that", I've been looking for more AI for it but it seems there aren't many, someone with more knowledge in AI can help me?