The Trio the Twins and

Once upon a time, there were three companions of individual strength, with bonds together that had them known throughout the lands as a force for good within their realm. One day, a lone warlock came upon them, pondering and wondering if they were worthy of their reputation and what they deemed themselves to be "friendship" ....

Or: Li Tianchen and Li Tianxi still want bedtime stories, no matter how old they get. And while Qian Jin obliges them, he only ever does so on his discouraging terms.