Snape sighed softly and quickly took them into the nursery that belonged to Harry. "Sh, sh Mr. Potter, it's okay," he made his way to the rocking chair. He didn't expect to need it this quickly, but made a silent vow to ensure Pippy his house elf was thanked appropriately.

Snape pulled off the soft blanket and covered the boy while rocking him softly. He patted his back rhythmically until his breathing became more even and under control.

"Calm, Mr. Potter, it's ok," he said over and over again.

"I-I… c-c-can-'t d-o-o thi-i-s," Harry stuttered from his ongoing upset.

"Mr. Potter, I cannot for the life of me understand your discontent. This is a regressive and training consequence of the easiest kind. I will take care of you. I will meet all of your physical, mental, emotional, and… other needs," Snape stumbled over the last part. It wasn't time for that yet. "You will want for nothing. You will be safe, disciplined, taught."

"I.. I-I don't wa-a-n-t be a ba-a-a-by," he gave into sobs again.

Snape ran his hand firmly down Harry's back. He learned a long time ago to run his hand only in downward strokes, if he went upwards it was excitatory. It would defeat the soothing purpose. There were no words now to convince the boy, it was just going to take time and patience.

As time passed slowly he felt the dampness on his shoulder, but the intensity of the sobs were dissipating. There were only small shakes from the boy in his lap. He couldn't imagine how tired the boy had to be. He had cried so much, he didn't know how he could keep his eyes open.

"Do you need anything Mr. Potter?" Snape asked gently.

Harry nodded slowly against Snape's shoulder. "Need go potty."

Snape nodded and slowly took off the boy's blanket and lead him over to the potty in the nursery. He set him on it gently.

"Can't here. Big bathroom please!" Harry's lip trembled. His feet didn't touch the floor. He looked so small with his shirt and no bottoms on.

He shook his head. "No Mr. Potter, this is your potty right now, you do your business here." Snape stepped back towards the rocking chair to give Harry a small amount of "privacy".

In a move of defiance and embarrassment, Harry leapt off the small potty and used his quickness to sprint out the nursery door. Snape sighed, pinched the bridge of his nose, and slowly stalked out of the room to follow the boy.

Wandlessly Severus locked the quarter's bathroom so that Harry couldn't reach the facilities there, and made sure the door leaving his private space was also locked. Harry could exhaust himself on his own by running around and tantruming, but Severus refused to chase him. He sat in a chair that allowed him to watch the boy scramble around the living areas in a pointless attempt of escape.

Harry ran frantic circles, fearful that Snape was going to put him over his lap and warm his bottom again. He ran toward the bathroom but found it locked, and wouldn't budge. He ran towards Severus' room, hoping another private bathroom existed, but was met with another shut door. When he ran through the living room, he eyed Snape in a chair, who made no move against him. The last possible escape was also locked. In an overwhelming emotional display, Harry threw himself on the floor, pounding with fists and feet.

Harry screamed, and screamed, and screamed. His fists and feet hurt from flailing. His throat was sore. His eyes could no longer tear up. The cries came out soundlessly and his face turned blue from lack of air. Snape still remained unmoving from his seat.

Harry, realizing nothing would come of this, sat up and softly stated, "I's done 'fessor." Letting the man know that he would stop tantruming, and wanted some soothing.

Snape got up smoothly and came over to Harry and picked him up, bringing him back to the nursery to set him on the potty. Harry held tightly around Snape's neck. He looked down at the potty and clenched tighter.

"I a-scared," Harry said in a tiny voice he didn't recognize.

"It's ok baby. It's just a potty. You go pee-pee and you'll be all done," Snape said in a soft voice.

Harry turned away and held on to Snape steadily and shook his head. He didn't want the potty. It made him a baby to use it. And he couldn't in front of his professor. It was too much.

"You want to rock another minute baby?" Snape asked, heading towards the rocking chair.

Harry nodded into Snape's shoulder.

Snape brought them together again and rocked Harry softly. He wiped the hair out of his face, it was sweaty with Harry's tantrum and crying. He accio'd a warm, wet cloth to wipe down his face and cool the boy down.

Harry took a steady, calming breath. He had to admit, the wash cloth felt good. Harry sighed into Snape's ear. He felt the tension of his neck, shoulders, and back relax into the older man.

As Severus began to rub Harry's back again, he felt a warm sensation spreading across the front of his chest and settling into the crotch of his pants. Harry had urinated on him in his relaxed state of babyhood. Snape groaned and pulled him back to see the wide, large wet spot covering his entire front.

Harry shrieked and tried to jump out of his lap. Severus kept hold of the boy and brought him to the changing table. Severus used the strap to snap across Harry's tummy so he couldn't fall off, and did a silent protective charm so the boy couldn't fight and hurt himself.

Harry was dreading the spanking that was sure to come to him. He could not believe that his body betrayed him and pissed on his professor. He could not imagine the amount of pain that would be bestowed upon him for this. He watched his professor with wide eyes from the changing table.

Severus made quick work of the accident. He stripped off his shirt, bearing his chest. He used a silent spell that Harry couldn't hear, and ensured his upper body was clean of the boys mess. He unbuckled his belt and took down his pants and boxers swiftly without pause. Again, a silent spell cleaned him off. He accio'd some fresh clothes, and dressed quickly. He noted that Harry's eyes never left his body, and that an erection was forming for both men.

Once dressed, Severus approached the changing table. He softly tickled Harry's tummy and smiled at him. "Accidents happen baby, it's ok bug."

Harry refused to look at him as Severus was so close. His lip trembled. Snape sighed and grabbed necessities from the changing table. He got a pacifier, and pushed it into Harry's mouth. He accepted it hesitantly, but sucked on it more and more fiercely as he got used to the soother.

Severus used baby wipes to wipe Harry down. He gently took off the shirt as it had splashes of urine on it. Harry shivered slightly, but still refused to look at the older man.

Severus put the diaper under Harry's bottom without a fuss. "Good boy," he whispered to his little one. Severus grinned as he saw the compliment made Harry not only blush, but his erection was becoming larger and harder than ever. He powdered the boy, and began to do slow, gentle strokes on his penis.

Harry's sucking on the pacifier became more desperate, rapid, and intense. Slowly his bottom would arch up, jerking himself into Severus' hand as he continued his strokes.

Around the pacifier Harry said, "What.. wh-a-t is happenin'? Wh-aa-t matt-er?"

Severus stopped his ministrations almost immediately. It wasn't possible, was it? The boy had never experienced an orgasm?

"Baby have you never touched yourself, or been touched by someone?" Snape asked, going past the mental defenses to see into the boy's mind. But all he saw was innocence. He only had a few erections in the mornings throughout his youth, but he had never touched himself or sought relief of any kind.

He could also see the intense nervousness and fear in the boy about what was happening to his body. Severus thought he could use this as a way to positively reinforce the use of diapers for the boy. He knew he would fight it tooth and nail if he didn't.

"I think you've been a good boy. Even with all those naughty words and spankings we had to do. Do you want this reward, baby boy?" Severus asked seductively.

He could see Harry's Adam's apple move as he gulped behind his pacifier. He looked at Severus with wide eyes, a bright red streaking his face.

"Just relax baby. Relax and feel, it's ok, we're safe and it feels good doesn't it?" Severus asked, using a calm, soothing voice. His strokes were done more quickly. He felt Harry's penis become completely solid, weeping pre-come into his hand.

"Such a good boy, letting me play with your pee-pee and make you feel good. Such a pretty pee-pee in my hand, making yummy come for me," Severus said, keeping his eyes locked with Harry intensely.

"Scary!" Harry said around his pacifier. "Too… too… much… HELP"

"It's a big feeling for a little boy. It's ok. Let me take care of you. Give me the yummy come baby. Let it come out, right here, it's ok, I have you," with that Snape put his lips around Harry's weeping head and gave a sudden and soft suck.

With that Harry exploded in Severus' mouth with a shout "DADDY!"