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The only public paizuri research institute in Japan, the Paizuri Research Institute, is the subject of this study, Noa Hazuki, a busty girl with 100cm I-cup breasts. We will study the paizuri of her beautiful, firm breasts. Noa is made to stand in her uniform in a dark laboratory. A researcher approaches her from behind and slowly massages her breasts. Even through her uniform, you can feel the texture of her breasts. As she is massaged, Noa becomes excited and is made to masturbate. She masturbates hard and cums over and over again. We take her off her uniform, observe her breasts, drip oil on her breasts and massage them while pressing them against a transparent acrylic plate, recording the changes in the shape of her shiny breasts. Then she does a paizuri with a dildo. She is instructed on how to do a paizuri vertically, horizontally, on her lower breast, and rubbing her nipples, and is led to ejaculation. After passing the dildo paizuri test, Noa now does a paizuri with the researcher's dick. After getting him fully erect with a blowjob that drips a lot of saliva, she is made to perform various variations of the titty fuck. The researchers can't help but ejaculate a huge amount of sperm! A bubble body wash experiment is performed on Noa-chan, who is wearing a see-through school swimsuit, with a lot of foam soap. While she is washing her body, they rub her breasts and make her feel good while giving her a bubble titty fuck. And in the final experiment, she is surrounded by all the researchers, and they all rub her big breasts and attack her with toys one after another, such as rotors, vibrators, dildos, etc., and she cums over and over again, exposing her ahegao face. Then she goes after the researchers' dicks and gives them a blowjob. One after another, she gives them a titty fuck, titty ejaculations, and fucks the big-cocked researchers with her big breasts bouncing, squirting all over the place as she screams and cums hard! Even after she cums, they continue to fuck her and the researchers squirt a huge amount of sperm onto Noa-chan's big breasts!