In this adult sibling role-play, my younger sister refuses to wear a bra because it feels restrictive and unknowingly tempts me with her nipples visible through her clothes. Her newly developed petite breasts leave little to the imagination, yet she remains completely careless. I decide to teach her a physical lesson by relentlessly teasing her nipples until she agrees to wear one. Instead of reflecting, she moans and begs for more, asking me to make her cum from nipple stimulation again.