Yuhi, my girlfriend and the manager of the tennis club, and I are dating. Yuhi is a beautiful, calm, and incredibly innocent girl. Therefore, we have kept our relationship pure; we haven't even held hands, let alone kissed. But why did this happen?! Rewind to the day when the entire club went to a training camp, where we stayed at a hot spring inn. The third-year senior is someone who only knows about sex, and every time he opens his mouth, it’s to mention those raunchy topics. And when I got here, I found out that the club has a tradition where first-year students have to wash the backs of the seniors. When the senior took off his towel, I felt extremely embarrassed to see that his thing was twice the size of mine! After finishing our bath, we returned to the resting room. A little while later, while passing by the bathroom, I was surprised to see the senior and Yuhi coming out together. Although the senior said Yuhi only helped him scratch his back and still wore a towel, I couldn't help but think of that image, a scenario I didn't want to happen! The next day, during the club's practice, both the senior and Yuhi were absent again. When they returned, I even heard the senior asking another senior to buy contraceptives. It must be that the senior had done something with the older sister at the store, whom he mentioned yesterday. On the last day, with only three hours until check-out time, the senior invited us to 'play' with that 'older sister' together, and even suggested that we could play naked since he had already prepared the contraceptives. Of course, I refused and went back to my room. When I went to check on Yuhi, I couldn't find her in the room; it was even a mess, with clothes, crumpled tissues, and the smell of sperm wafting in the air! A wave of fear rushed into my mind. I went to the second-year senior's room but found no one there. But when I arrived at the room of the third-year senior, the sounds of moans and flesh hitting resonated like a blow to my heart. Shakingly opening the door, it felt as if the whole world was collapsing before my eyes...