Ever since my little sister was young, she has always been close to me! She grew up to be an incredibly busty woman! When we were kids, we used to take baths together all the time, but now that she's grown... well, let's just say things have changed. One day, out of the blue, she asked if we could take a bath together again. Of course, I agreed without hesitation. As soon as we got in the tub, I couldn't help but notice her huge breasts. They were so big and beautiful that they naturally caught my attention. But then something else started happening—my penis began to swell! It was embarrassing, but there was nothing I could do about it. My sister must have noticed too because she came closer and closer. "Damn it," I thought. "We can't do this; we're siblings!" But at the same time, I really wanted her. She kept coming towards me, teasing me with her body. There was no stopping her! Finally, I gave in to temptation. We ended up having passionate sex right there in the bathtub. It felt so wrong yet so right at the same time. Afterward, we both knew we couldn't go back to being just brother and sister anymore. Our relationship had crossed a line, and there was no turning back.

昔から仲が良い妹は超巨乳女子に成長！！！小さい頃はよく一緒にお風呂に入っていたが今は流石に…。と思っていたら一緒にお風呂に入りたがる妹！一緒に入っていたら当然、大きな胸が気になってしまうわけで…そしたらボクのアソコも膨らんでしまうわけで…。ヤバイと思い勃起チ○ポを慌てて隠しても時すでに遅し！発情状態の妹はグイグイ来る！ダメだ！ダメだ！兄妹でエッチなんて！でもボクもヤリたくて仕方ない…。