Lightheaded
The next morning, Hermione woke up and saw that her diaper was wet and yellow. She blushed when she realized that she wasn't wearing any pants. After she sat up, she took her thumb out of her mouth and changed into new diaper, noticing that the baby powder was helping with her diaper rash. She made sure that she put pants on, and went down to the common room. She met Harry, Ron and Hermione and the three went down to breakfast. Down at breakfast, Hermione once again started to think about drinking from a baby bottle. She tried to put the thought out of her mind, but it was so intense, she didn't even attempt to drink from her normal cup.
After breakfast, Hermione went to her first class. During that class, she felt lightheaded. Because of her lightheadedness, she was unable to write coherently, or even think clearly. She didn't even think she'd be able to walk if she tried. The lightheadedness became so severe, she didn't even realize as she passed out.
Hermione woke up a few minutes before the class was scheduled to end. She once again found herself sucking her thumb, but it didn't seem like anybody saw her since she sat in the back of the class. She noticed that her lightheadedness had gone away, and found that she could walk, albeit a little wobbly. She left the class, and felt her lightheadedness return. She wobbled to the common room, forgetting that she still had classes, and fell into her bed, hoping the world would stop spinning. When she thought she was fine she sat up, and tried to figure out what was happening. Hermione then remembered that she hadn't drunken anything all day. She thought that might have been the problem, so she grabbed her wand to summon a glass of water. As she went to do it, however, the nagging thought of a baby bottle returned. In order to rid her mind of the thought, she summoned a baby bottle full of warm milk, and began to suckle. She didn't stop until she had finished the milk and then magically refilled it. After the second round, she dropped the bottle on the bed, and just sat there, sucking her thumb.
After about 20 minutes, she realized what she was doing, and tried to stop. Hermione found that she was unable to stop, however, and grabbed her wand with her free hand. She tried to do something to get her thumb out of her mouth, but instead she ended up summoning a pacifier. She was then able to take her thumb out of her mouth, and used her drool-covered hand to put the pacifier in her mouth. She sat there sucking on it, not realizing that she was peeing as she did so.
Later, she realized that her diaper was wet, and went to go change it. She took off her pants, and ended up falling off the bed in her attempt to grab a diaper. When she hit the ground, she instantly started crying like a baby. After a few minutes of crying, she started to calm down as the pain resided. When she fully stopped crying, she forgot why she was on the floor to begin with. She crawled around the room, playing with anything she could get her hands on. As she was playing with a book that she found, she started speaking in random baby babble. As she did, she felt her stomach rumble and felt a weird feeling on her butt. A few seconds later, she smelt something foul. Not realizing that smell was coming from her diaper, she crawled around, trying to find the source of the foul aroma. After awhile, she crawled into her bed and fell asleep, wearing nothing but a shirt and a wet/messy diaper, and sucking on a pacifier.