Ruka, my cute stepsister from our parents' remarriage, has god-tier tits that drive me crazy! One day, I couldn't hold back and made a move, but I was crushed when she rejected me, calling me "gross"... But the next day, an unexpected turn of events! I caught Ruka alone, lingeringly masturbating her own nipples! It turns out we both had feelings for each other, and we crossed the line in no time! With our parents away at a hot spring, we evolved into secret fuck buddy siblings! During studying, under the dining table, in the bath... our thrill-filled sex life began, all while hiding it from our parents! We aren't blood-related, so it's fine, right?
