Ayako, with her H-cup breasts, first masturbated when she was 10 years old. The shock of seeing an erotic magazine she found while playing hide-and-seek with friends made her developing breasts tingle, and she started playing with them. She found her nipples incredibly pleasurable and continued to play with them, resulting in now large, constantly erect nipples (estimated diameter: 2.3cm) even when not erect. She's now married and has sex with her husband almost every day...