【禁断の姉弟セックスが相性バツグンすぎてイキまくる…！】予備校に通う義弟と同居している兄姉のなつき。なつきに憧れを抱き’10秒だけ’の挿入を懇願すると…まさかのドストライク過ぎてマンコ即イキ絶頂！ダメだと分かっているはずなのに…腰と性欲が止まらず何度も求めあう！隙あらば、10秒…もう10秒とハメまくる！清楚だったなつきさんのイキっぷりが良すぎて連続射精！2人だけのヒミツ濃厚中出し！もっともっとチンポとマンコで満たしたい…。理性飛ぶほど気持ちよすぎた…。
[Forbidden sibling sex is so compatible that they cum over and over…!] Natsuki lives with her stepbrother who attends cram school. Her stepbrother, who has a crush on Natsuki, begs her for just 10 seconds of penetration… and it's so perfect that her pussy instantly cums! She knows it's wrong, but her hips and lust can't be stopped, and they keep asking for more! Whenever there's a chance, they keep fucking for 10 seconds… and another 10 seconds! The innocent Natsuki cums so much that he ejaculates repeatedly! A secret, intense cumshot just for the two of them! He wants to fill her up with his dick and pussy more and more… It felt so good that he lost all reason…

– JavGG.net