Why does Tsunade punish Hinata in Naruto?

Tsunade was not punishing Hinata in that episode. Because although Hinata failed in the mission, it was just a small mission. In fact, Tsunade felt affection for Hinata when she saw Hinata hesitantly admitting her mistake. Seeing that there was no one else in the office, she wanted to tease Hinata. Pretending to be angry, he tied Hinata up and said he would be severely punished. After Hinata closed her eyes in fear, what she was waiting for was the coldness on her feet as her shoes were taken off, followed by the itching from the soles of her feet. Facing Tsunade, who has the strongest monster power, Hinata's struggle is in vain. She knew she couldn't laugh out loud in front of the Hokage, so she could only press her lips together and hold back, her face turning red. However, this further aroused Tsunade's desire to tease her. As Tsunade's fingers came into contact with Hinata's soles, The frequency became faster and faster, and Hinata's mouth slowly began to move upward uncontrollably. This "punishment" is destined to be long, but Tsunade is not the kind of person who likes to bully her juniors. She has already taken off her shoes, because she knows that after this "punishment" is over, she can make the aggrieved Hinata accept her. The only way to apologize is to empathize with the role reversal. He couldn't help but wonder, when Hinata's hands were walking under his big feet, how long could he hold on without losing his composure?