My wife and I are going through a rough patch in our marriage when my adorable younger sister catches my eye... We can't help but sneak away for passionate affairs while our wives aren't looking. There's no turning back now... I empty myself inside her over and over again until there's nothing left. She teases me by asking how my wife would feel if she knew about us crossing that forbidden line together. Our secret, illicit relationship has taken things too far.

「ねえ…お姉ちゃんとどっちが気持ち良い？」妻と倦怠期中の僕は可愛い義妹に夢中になってしまい…嫁の目を盗んで濃密な不倫SEXを繰り返している…。もう後戻りは出来ない…。僕は精子が枯れ果てるまで何度も何度も義妹の膣中に吐精した…。「お義兄さんと私がセックスしてるの知ったら、お姉ちゃんどう思うかな…？」小悪魔であざとい妻の妹と一線を越えてしまった禁断の関係。