Bi Bi had a habit of sleeping with her head resting on Grandpa's arm. It was the only way Bi Bi could fall asleep. Grandpa would let Bi Bi rest her head on his arm, but once she fell asleep, he would gently withdraw his arm and place a small pillow under Bi Bi's head.

One day, due to exhaustion, Grandpa fell asleep and forgot to withdraw his arm. After a while, the hand began to cry out, "Ahem... it hurts! Oh... it hurts so much!" With no response, the hand began to shake. Feeling something poking her neck, Bi Bi opened her eyes, then fell back asleep. Later, the hand jerked up again, pleading for help. Bi Bi, feeling prodded in the neck, shifted slightly. Half of Grandpa's arm was freed, and it stopped hurting. However, the remaining part of the arm, still trapped, wriggled and strained, eventually flinging itself across Grandpa's face. Startled, Grandpa jerked his arm, causing Bi Bi's head to bump lightly on the bed. Bi Bi woke up, sitting up suddenly. Grandpa's entire arm was now free, waving around to relieve the numbness. Still drowsy, Bi Bi lay back down, feeling uncomfortable because there was nothing soft underneath. She asked, "Where's the pillow?" and once again rested her head on Grandpa's right arm.

Since that evening, the pillow felt neglected, sulking and rolling into a corner of the bed. Hearing Bi Bi's call, the pillow responded:

"I'm here!""Who's there?""It's me, the pillow! I'm your sister's pillow!""Why are you in the corner?""Because your sister always uses Grandpa's arm as a pillow and forgets about me.""Do you like being a pillow?""Of course. I'm made for it.""Aren't you afraid of getting hurt?""No, because I'm a pillow. Grandpa's arm hurts because it's not a pillow and isn't used to being pressed."

Seeing Bi Bi attentively listening, the pillow continued:

"You know, every night Grandpa's arm complains to me about being numb. Sometimes Grandpa moves it away from your head, but when he sees you tossing and turning, afraid you'll wake up, he places it back under your head, so it just complains to me about the pain. But today, it got fed up with being trapped for so long, so it got angry with Grandpa... Earlier, it kept calling for you to help, but I couldn't do anything because I'm too weak, even though I love being a pillow."

The pillow also complained that Bi Bi was too messy, never pressing it properly, and always relying on Grandpa's arm, making it numb and miserable. Grandpa's arm explained that it was due to Bi Bi's affection, wanting to cuddle with Grandpa before sleeping, not intending to hurt the arm.

Bi Bi was surprised:

"Really? I never heard Grandpa's arm complain.""Because Grandpa's afraid you won't sleep, so he stays quiet. Now he's too tired, so he fell asleep forgetting to withdraw his arm. Let me wake him up."

The pillow rolled towards Grandpa and placed its edge on his nose. Grandpa sneezed and woke up. He moved his left hand to Bi Bi's side. Bi Bi told him:

"Grandpa, please withdraw your right hand; it's hurting." He withdrew his hand. The pillow quickly slid down to Bi Bi's head. Bi Bi felt comfortable and cool. She hugged Grandpa's arm around her neck, saying:"From now on, I'll only use pillows to rest, Grandpa." After that, everyone drifted into a peaceful sleep.