Kari and Tai Tai got up and saw he was drenched in pee. his sister, Kari, walked in his room and saw he had wet the bed again. she laughed and said: "well, good morning, baby Taichi. how did we sleep?" Tai stood up and yawned. "Okay, please don't tell mom about my wetting." Kari grinned. "Okay, but you have to do me a favor," Tai poured himself a cup of coffee. "Which is...?" Kari: "since mom will be gone for one week, I thought that you and I could pretend to be mommy and baby?" Tai nearly choked on his coffee. Kari walked over to him and pounded him on the back. "Come on, Tai, it'll be fun." Tai sighed. "How old?" Kari thought for a moment. "Oh, about, 8 months." Tai was about to pull down his shorts, when Kari did it for him. She also started to pull down his boxers, when Tai stopped her. "Oh, come on, Tai, you're my brother, and its not like I've never seen your dick before, either." She finished pulling down his boxers. She told Tai to go take a shower before mom woke up. He jumped in the shower and turned on hot water. He washed his hair and body to get the urine smell out. When he dried off and walked back to his room to get dressed, he saw Kari putting out his clothes to wear for the day. Tai: "Kari? what are you doing?" Kari turned around and grinned at him. "Helping my baby son." She threw some clothes at him. he put them on. The clothes were a black t- shirt, blue boxers, white socks and dark blue jeans. Kari and Tai heard their mom grab her suitcase and open the door. "Bye, kids!" after 40 minutes, Kari was sure that her mom was gone, so she grabbed Tai and ran towards his car. She started it up and drove to the supermarket. she walked in and went to the baby department. She grabbed a mega pack of Pampers size 10. She also grabbed a pack of Huggies wipes. She next went to the baby clothes department. she took a sleeper and some baby clothes that snap together at the crotch. She and Tai walked up to the counter to pay. The man looked at Tai strangely but continued to ring up the items. Kari drove home and ran up the stairs. she told Tai to lay down. Kari pulled one of the diapers from the package and pulled off Tai's jeans and boxers at the same time. She told Tai to lift up. She slid the diaper under him and taped it up. She had also got some plastic pants. She pulled one over the diaper. She pulled out a pacifier and gently slid it between his lips. She walked away and Tai followed her. She turned around and told him to crawl. He crawled to her and she pick him up. About 30 minutes later, Tai had to pee bad. Tai thought 'well, I'm wearing a diaper, so...' He relaxed his bladder and let his pee flow into the diaper. The diaper started to sag a little bit. Kari noticed this and said: "oh..baby Taichi made a pee-pee." Tai blushed. Kari grabbed a diaper, the wipes, and baby powder. She undid the tapes on the diaper and pulled it from under him. She grabbed a baby wipe and cleaned Tai's genitals. she next took the baby powder and rubbed some on Tai's crotch. Tai blushed furiously as he started to get a erection. Kari saw and laughed. "Baby Taichi likes it, doesn't he?" Tai blushed again as he found out Kari had noticed. Kari took another diaper and told Tai to lift up again. she slid the diaper under him and taped the tapes up tightly. she pick Tai up and went downstairs. She put the movie 'Mortal Kombat' in the VCR and held Tai on her lap. She hugged Tai during the scary parts of the movie. After a hour, Tai fell asleep. When the movie was over, Kari looked at Tai and found him to be asleep. She smiled gently and picked him up and carried him upstairs and laid him on his bed. She kissed him on the cheek and said: "Goodnite, Tai." The next morning, Tai jumped out of bed. Kari had been downstairs since 7:00. it was 10:00 now. Tai open his bedroom door and walked down the stairs. Kari turn around and stood up. "good morning, Taichi." She stuck a finger in his plastic pants and finds it to be wet. Tai blushed. Kari said: "Tai, you're my brother, don't be embarrassed, in fact, I like taking care of you." Tai was shocked, "Really? wow, I also love you babying me." "Okay, lay down, Tai." she pulled the tapes off the diaper and pulled it from under him. she cleans him up with wipe and pulled a new diaper snug between his legs and taped it shut.