My first girlfriend turned out to be a promiscuous slut, what the locals called a "common sex toy"... (Shiraku Yuhi CAWD-764)

My first girlfriend was pure, quiet, intelligent, and gentle—my ideal girlfriend… One day, she forgot her phone when she got home, and I couldn't resist sneaking a peek at the screen. Could she be lying? The phone displayed a chat group called "Common Toilet," with photos of her dressed in a lewd manner. I told myself it was probably a joke or spam. However, she said she was going back to her hometown to visit relatives, which suddenly made my heart race. Worried about her, I called, but received no answer. Finally, she answered, saying, "Sorry I didn't answer. I'm not feeling well; I'll call you right away." Her hesitant speech made me even more anxious. I decided to visit her at her house, and seeing that she looked healthy, I breathed a sigh of relief. However, a mischievous boy I'd known since childhood suddenly appeared, startling me. I had so many questions for her, but I was drugged and drunk. When I woke up, I saw her greedily enjoying countless penises, experiencing frenzied orgasms—a side of her I'd never seen before… She said it was just a joke, but I found that my penis was already very hard...