親戚の子がお泊まりに来てて、ずっと一緒に遊んでたよ！可愛くて癒されたけど、体力使い果たした〜。笑
I’ll interpret it creatively as a story about someone who ended up doing unusual or meaningful work after an overnight stay with a younger relative — perhaps a cousin, niece, or nephew. Here’s a story based on that idea. shinseki no ko to o tomari de kara ita work
Shinseki no Ko to Otomari Dakara (roughly translated as "Since I'm Staying Over with a Relative's Child") is a Japanese adult visual novel or manga-style story. While there is limited mainstream academic analysis of the work, it typically explores themes common to the "slice-of-life" and "forbidden romance" genres. Shinseki no ko = relative’s child / cousin
Introduction
These works share the keyword’s DNA: family + closeness + pain. Shinseki no Ko to Otomari Dakara (roughly translated