My little sister suddenly came to visit me in my room. She said she didn't understand her studies, so I helped her, but she got tired and fell asleep in the middle of the lesson. I was aroused by her sleeping face and started to play with her so that she wouldn't notice, but I was so engrossed that I didn't notice that she had woken up! My little sister couldn't stand to see that and said, "I'll just rub you." I did a sumata. That was all we had promised, but...?