Otoko Girai na Bijin Shimai wo Namae mo Tsugezu ni Tasuketara Ittai Donaru? 6 (Kadokawa Sneaker Bunko) [Light Novel]

[Machine Translation] I finally confided in my best friend about my secret relationship with my sisters, and although I get teased about it from time to time, I am living my school life peacefully. After happily completing events such as ball game tournaments and regular exams, the big event of the summer vacation arrived. It was a trip with... A trip with the Shinjo family. The beautiful sisters are of course at their peak of excitement in front of the perfect environment where they can make out as much as they want at their beach house without worrying about being seen! Help me put on my bathing suit? Help me put on my bathing suit? Do you want to? It's just an extension of daily skinship. But the unusual environment, the bare skin touching each other.... My reason, buoyed by the summer, is on the verge of collapse, and I unintentionally leak my suppressed desires to my sisters.

内緒にしていた姉妹との交際関係を親友にようやく打ち明けた俺は、時々そのことでからかわれながらも平穏に学校生活を送っている。球技大会や定期テストなどの行事を楽しく終え、迎えた夏休みの一大イベント。それは...新条一家との旅行。人目を気にすることなく海辺の別荘でイチャイチャし放題な最高の環境を前に、もちろん美人姉妹のテンションも最高潮!「水着着るの手伝って?」「もっと刺激的なこと...する?」日常のスキンシップの延長線上。だけどいつもとは違う環境、触れ合う素肌...夏に浮かされた俺の理性はいよいよ崩壊寸前になって、抑えていた欲望を思わず姉妹に漏らしてしまい!?