They'll All Find Out That It's Inside Me! (Having sex with my classmate who's hiding under the covers)

"No… I can't let it show on my face that I'm… Hnng!!" A group of three boys set off on a completely sex-free hot spring vacation... Or at least, they were supposed to. But in an unexpected twist, they run into three girls from their very own class after checking into the hotel! After panicking and h