22-year-old law student and track club member Matsuri, a charming Kansai-speaking, aloof older sister type who walks the streets daily with her boyfriend—a highly educated female college student. We approach her with an offer for a high-paying part-time job, luring her into a special studio setup. Her tight dress accentuates her chest and waist, highlighting her sexiness. While chatting about her everyday life with her boyfriend, the real purpose of today's session is revealed: a monitoring survey on NAS○'s newly developed ultra-thin sheet. Initially hesitant—"I have a boyfriend, so..."—but faced with stacks of cash, she strips off her dress, places the sheet over her crotch, and lets out a Kansai-style moan. "Ah... ahh," she gasps, speechless. Gently stroking over the sheet, she murmurs, "H-have never felt anything like this before... It's kinda... good?" clearly enjoying this new sensation. In sideways doggystyle grinding, she pleads, "D-don't... I'm getting more turned on than usual..." giving lewd reactions. This entirely new pussy stimulation makes her horny juices drip steadily. "Since it's through the sheet, it's not cheating, right? This is serious monitoring research after all... But... but I'm getting so turned on!" Her body writhes uncontrollably. Unable to resist, she mounts the dick, asking, "What should I do?" while skillfully grinding her hips (laughs). Finally, she exclaims, "Wait...? It's going in, right? I'm taking it inside!" shamelessly impaling herself on the thick cock through the sheet. She thoroughly enjoys herself, climaxing for real—wild and lost in orgasm—cum shot on the sheet. "I can't tell unless I compare it to bareback!" she insists, deeply sucking the cock from the root with juicy blowjob sounds. Her slutty tongue work, bedroom eyes, and ultra-sensitive tits drive things further. Once real cock is inside, desire wins. In rear cowgirl position, her plump ass slaps hard with every thrust. "Honestly, it feels way better without the sheet!" she moans, libido fully unleashed. The effect of the ultra-thin sheet is insane! Is she cumming too much to handle?