[Nise] Brother and Sister Who Don't Put It In

When a curious older sister and her younger brother find themselves alone at the dinner table, a conversation about separate bedrooms quickly spirals into a hands-on experiment with their parents' forgotten bedroom toys. With trembling curiosity driving them, the petite big sister guides her nervous little brother through strapping on the well-used equipment, leading to a steamy sibling encounter where desperate moans of "I'm cumming" echo between them. Their risky romp finally ends with a flushed, post-coital afterglow—right before an oblivious friend drops by, forcing them to scramble and hide the evidence of their taboo playtime.