MIDV-547 "Stroking with your hand doesn't count as cheating, right?" At the inn where we stayed three nights I was rubbed into submission by my girlfriend's little-devil sister's handjob — ejaculated 13 times and was cuckolded (Ishikawa Mio)

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Because my girlfriend won't do anything unless I set the mood, I splurged and invited her on a hot-spring trip. To make sex harder, she brought her sister and I thought I was done for — but her sister Mio turned out to be a hidden nymphomaniac; contrary to her pure-looking appearance she started seducing me as soon as we arrived at the inn: “Stroking with your hand doesn't count as cheating, right? No idea though.” Though filled with guilt, I gave in to her little-devil temptations. Across the three nights she kept masturbating me by hand; her too-cute face, whispered dirty talk and technique completely broke me. I ejaculated 13 times and was cuckolded. — 石川澪