Bad Women, Don't Be Evil, I'm Really Just an Inner Demon

(Time travel + system (less scenes) + fairy + blackening + Shura field + multiple female protagonists + fantasy imagination) Li Xiao has a system that allows him to randomly possess fairies and become their inner demon. As long as he successfully teaches them, Li Xiao will copy their abilities and points. Anyway, they don't know who he is or where he is. Then enlighten me directly! "You said that as long as I stop being timid, you can be with me forever. Is that true?" "Yes!" I'm lying to you. If I'm really with you, why should I use the wool of the system? It's moisturized, Li Xiaorun's is very crisp. Until one day many years later, they actually came to the door with a hatchet!