Innocent Japanese teen Hiromi, alone in her room, begins a naughty exploration. She tentatively touches herself, her fingers rubbing her clit, as she imagines someone watching. She reaches for a huge dildo, teasing her tight pussy with the tip before sliding it in. Lost in pleasure, she doesn't hear the door open. Her brother stands there, shocked but intrigued, as Hiromi fucks herself with the massive toy. He tentatively approaches, his cock hardening. Hiromi, embarrassed but excited, lets him join. He replaces the toy with his cock, fucking her until they both cum hard.