A plain-looking girl who came for a clinical trial part-time job undergoes an aphrodisiac human experiment! 'Somehow, my body is hot...' During observation, she can't stop her desires and licks the penis shamelessly, having sex with a doctor she just met! Thinking it's because of the aphrodisiac effect that she became lewd, but even after the effect wears off, she still craves the penis, pushing it deep into her womb while sweating profusely with obscene hip movements! The hidden true nature of the plain-looking girl is fully exposed!
