After school in the classroom, she is caught unexpectedly masturbating her nipples, and he watches her intently, heart pounding. Deciding to let her continue right there, he helps build her arousal. Firmly pinching her nipples until they stand erect, he carefully licks and teases the tips with his agile tongue. Slathered in sticky saliva, the slippery stimulation intensifies her pleasure until she can't hold back and climaxes through her nipples. Next, Mary uses her long tongue to torment Ai's sensitive nipples, making her gasp and moan from the overwhelming sensation. Twitching and convulsing with the sucking sensation, Ai finally reaches orgasm through her nipples.