The scenario you're describing often pops up in certain genres of fiction, particularly those exploring taboo or psychological themes. From a narrative standpoint, it might symbolize rebellion, a twisted form of intimacy, or even a character's unresolved trauma. I've come across similar motifs in older Japanese literature where clothing acts as a vessel for hidden desires—like in Junichiro Tanizaki's works, where objects become fetishized.
In modern stories, though, it could just be shock value or lazy writing. But when done thoughtfully, it forces readers to question power dynamics. The boy might be reclaiming control in a stifling household, or it could mirror his confusion about adulthood. Either way, it’s rarely just about the panties; there’s usually layers beneath the surface, even if they’re messy or uncomfortable to unpack.