A year into her corporate job in the advertising industry, the older sister of my friend S kindly agreed under certain conditions to participate during her summer break. From August 10th to 14th—five full days—she generously offered her time. The filming allowed nearly anything except outright filthy acts, and unlimited access to her bare breasts (including breast fucking) was permitted. My friend S had been complaining, "I'm practically bankrupt!" so I jokingly suggested this arrangement, which surprisingly wasn't hard to negotiate. Deeply grateful for the otaku mindset's single-minded focus, I fully immersed myself in the world of doujin succubi, indulging wildly and greedily in obscene, pleasure-driven blowjobs and nipple fucking as if cum were my fuel. When she murmured, "I guess I'd rather do this with you than jerk off like my otaku friends," my excitement only grew. Unlike typical promiscuous girls, she was slightly awkward, but that added to her charm—she'd actually studied TikT●ker's guide on "Ghost Blowjob Techniques That Make Your Boyfriend Obsessed," preparing in advance. Since I'd always found her face and body attractive, I soon lost all rational thought, reaching my limit while recording and sharing everything on my phone (lol). Her reactions were thrilling, so expect extremely intense scenes. ※I did not penetrate the subject.