While walking through the downtown office district at night, I unexpectedly meet two beautiful office ladies. When I tell them I'm conducting a survey for data collection, the surprisingly friendly pair willingly agree to participate. They introduce themselves as Mizuho, the senior colleague, and Riko, the junior. Both reveal they're single, sharing a mutual interest in romance. After I honestly admit I've been drinking earlier, they're intrigued by the incentive offered and have no intention of refusing. Drawn in by their warm personalities, I follow them to a hotel. There, we use alcohol to loosen up and enhance the mood as the survey progresses. Riko mentions she hasn't had sex recently and confesses to fantasizing and masturbating alone. Meanwhile, I find out Mizuho prefers manual stimulation and regularly uses a vibrator. She actually brings out her personal vibrator, and under the condition of "just for a moment," I place it on Riko's chest over her clothes. The vibrator works incredibly well even on beginners, immediately eliciting reactions from both women. Mizuho shyly begins using it on herself too, visibly enjoying the sensation. Riding this momentum, I begin testing Mizuho's sensitivity—licking her ears, touching her breasts, carefully building arousal. When I ask her to show me her underwear, she reveals a high-end blue bra and panty set, complete with seductive side straps. She's also wearing garter stockings, clearly showing her pent-up frustration as a woman in her thirties. Seeing this excites Riko, who watches nervously yet visibly aroused. Both women begin stimulating each other with flirtatious glances, enjoying mutual pleasure. Eventually, they move into separate rooms, diving into uninhibited, hardcore sex—transforming their professional coworker relationship into a deeply intimate encounter.