[Marushamo] Kouhai no Ooki Oppai ni Shimawareru | Between big boobs

A phenomenon called 'tinyfication' shrinks a young man to a mere two centimeters, where shrunken males are treated like pets—and his teasing kouhai Mau claims him as her own toy. Wedged into the sweat-slick valley of her enormous cleavage, 'punished' on her finger until he passes out, and mocked as small enough to be mistaken for dandruff, he still can't resist pleasuring himself against her bare chest while the class goes on around them. Just when he fears she'll toss him aside, she reveals the threats of parting ways were a joke, restores him to full size inside a little bottle, and sweetly invites him to go another round between her jugs.