A-chan, with her massive H-cup breasts, possesses a voluptuous figure that no clothing can fully conceal. An animal lover who works part-time at a veterinary clinic, her daily interactions with coworkers often turn erotic. The animals are drawn to her affectionate nature and show keen interest in her large breasts. Her breasts began developing in upper elementary school; she initially wore sports bras to hide them, but by middle school, they had grown too large, forcing her to switch to adult-sized bras. To the boys at school, A-chan's breasts were a major source of excitement and daily inspiration—pure, irresistible fantasy material. As a high school girl becoming more aware of her body, she found herself envied by female friends and adored by her first boyfriend. Yet physical education class remained a torment. Running caused her breasts to bounce uncontrollably, and the friction from her bra would stimulate her nipples, making them wet and aroused. Though used to male attention, having to continue exercising while soaked and aroused was deeply distressing. Immediately after class, she would rush to the bathroom, touch her wet clitoris, and climax almost instantly. She'd wipe her stained panties with tissues and return to the changing room as if nothing had happened. A-chan's libido grew stronger alongside her breasts, fueling a desire to feel even greater pleasure—and a growing wish to bring joy to more people through her big tits.