寝てるお兄ちゃんのアレを借りる話

"I'm sorry, big brother! Please let me borrow this for a little while...!" The precocious schoolgirl Yuna is very interested in naughty stuff. One night, unable to be satisfied with just masturbating, she gently sneaks into her sleeping big brother's room... This is a story about a little sister who borrows her big brother's dick, and ends up pleasuring herself as much as she wants with it. Her big brother won't wake up until morning. (Source: DLsite, translated)