Even for girls with more sensitive nipples than most, it seems to be quite difficult to cum just from nipple masturbation. One day, a girl's lower body started to ache from nipple masturbation, so she put a pillow on her bed between her legs. Then... the stimulation of her nipples was transmitted to the core of her body, and the object between her legs seemed to rub her pussy with her legs stretched out comfortably! With her nipples teased and her legs stretched out with an object between her legs... the girls cum right from the "core of their bodies"!