"My Gen Z brother is a shut-in..." He sucks her nipple every day. (PPPE-283)

"I let my younger brother suckle my nipple every day..." About a month ago, something happened to her brother at work, and he was depressed and didn't go to work for several days... "I let my brother suckle my nipple to help him reintegrate into society... I feel uncomfortable... really uncomfortable..." The older sister lets her brother suckle her nipple for her sake, and the younger brother suckles his older sister's nipple to cheer himself up. This has crossed the line between siblings and become a nipple-dependent relationship...