The sexy target is a woman who seems to enjoy playing with her "recorder," which could refer to either an actual musical instrument or a sex toy shaped like one. She's engaged in a playful banter with someone she calls "Onii-chan," possibly a younger brother figure. They discuss using his firmer version of the recorder because she hasn't been practicing enough on hers. Despite some initial hesitation from him about being teased, they both seem to find pleasure in exploring each other's recorders. Ultimately, she prefers his over hers, adding another layer of sexual tension between them.
