The Paizuri Research Institute is a specialized facility that scientifically studies the breasts of big-breasted young girls across Japan. This time, the subject is Tomoko Kamisaka, a stunning beauty with I-cup explosive breasts. Her sensitive, massive tits are first kneaded roughly through her school uniform, eliciting cute moans, but once exposed, direct handling reshapes them into the perfect package. Coated in oil and pressed against acrylic boards, the deformation and squishiness of her breasts are meticulously observed. A dildo is then used to perform titty fucks, simultaneously studying the wetness of her pussy. The researchers deepen their understanding by using their own cocks for real paizuri sessions. Her milk-heavy breasts, now drenched in cum, are washed with soapy lather over her school swimsuit, further stimulating her arousal. Finally, she experiences a wild titty-fuck frenzy as multiple researchers use her breasts and pussy at once, invading both holes aggressively. Tomoko Kamisaka, climaxing repeatedly while being showered in massive loads of cum, fully embraces her role—this is the cutting edge of paizuri research.