In His Little Ass

Patting her lap Tonks spoke, "Come over here and sit on your big sister Tonk's lap sissy."

With an affronted face, Harry had was **** to follow the order and sit on Tonks lap with her girl cock touching his ass. Harry tried say something, but before he was able to Tonks had something else to say, "This is a cute little ass you got there Harry," she said as she was fondling him. "It could be better," was all that Tonks had to say before waving her wand towards Harry.

Harry thought about trying to get out of the way of the spell, but he wasn't given a order to move and Tonks still had a good grip on his ass with one hand. Harry felt his backside start to tingle and wasn't sure what was going on until it hand ended and Tonks have his ass a slap with her now free hand.

Squeezing his now larger ass Tonks bragged, "That's right Harry, I enlarged your cute sissy ass and made it more sensitive, cause your boy pussy is gunna be filled with lots of girl cock from now on."

Unable to keep from moaning, Harry was ashamed. With one more spell cast Harry felt a warm wave pass through his ass and then a cold feeling following it.

"Now," instructed Tonks, "I'm going to prepare your little sissy hole for my big girl cock." She slid two fingers past the puckered lips of her boy toy's ass with one hand and continued to slap and grope his ass with the other. Grinning wolfishly as her slut moaned on her fingers, Tonks slipped another finger in Harry's ass.

Pulling her fingers out of her slut's tight hole she gave his ass one last firm squeeze with both hands making him moan from the feeling of his loosened asshole and ass being fondled. Looking down at her toy, Tonks ordered, "Now that your all lubed and loosened up, sit down on my cock with that little sissy hole of yours."

Try as he might, Harry was unable to anything but raise his ass and then lower his hole onto Tonks large girl cock. Both moaned as Harry pushed his ass down on Tonks' dick. Harry was unable to stop himself from whining from the feeling of his asshole being stuffed with cock. Tonks was groaning from the tight feeling of her new boy toy's tight sissy hole squeezing her girl cock with his ass.

"That's it," Tonks growled, as Harry final sank all the way onto her ten inch dick. He was mewling as Tonks kneaded his ass while it was filled with cock.

"Start bouncing on by girl dick Harry," Tonks commanded. He did as he was ordered and started to bounce up and down in Tonk's lap on her cock.

The only sounds in the compartment were the whimpering and squeaking from Harry as he lifted himself up and down on girl cock, and the grunting and slapping from Tonks, as her sissy's ass landed on her lap.

Grabbing his ass as he bounced, Tonks leaded back in her seat, her cock hitting a different spot in Harry's ass causing him to squeal. "Oh-ho-ho, I found your sweet spot didn't I," Tonks bragged as she continued to hit the cluster of nerves in his ass with her dick.

As her boy toy continued to wail and howl from the anal penetration Tonks couldn't help but comment, "That right sissy, this is what your going to do for the rest of your life, I'm going to use you like my personal onahole. Tell me what your job is slut," Tonks finished with a slap to the ass.

Harry, not being able to think straight from his ass being permanently stretched to fit Tonks girl cock could only whimper out, "B-big S-sister T-tonks! I-i'm your p-personal sissy -onahole for the rest of my l-life!"

"And how much do you love my big thick girl cock in your tight sluty hole? How often do you want my big pole to fill you up?" Tonks demanded.

"I love your big thick girl cock in my tight slut hole!" Harry yelled from pleasure, "I want your big pole to filling up my sissy ass all the time!" Harry squealed, as Tonks started thrusting up to meet his riding.

Hearing her sissy boy toy shout out how much loved her dick filling him up caused her to cum, "Cum! Cum with with me while I fill you with my girl cum!" Tonks bellowed. Harry squawked and shrieked as he came, feeling his tight hole being filled up with Tonks baby batter, "Ieeeeee, ahhhhhhhhhhhhhh!"

After the last squirt of of cum had been ejaculated into her boy toy's ass, Tonks pulled her girl cock out of the hole with a pop. Laying him over her lap so that none of her girl cum leaked out she used one hand grab a buttplug with a yellow gem from her bag.

Still overwhelmed from the serious fucking he just received Harry didn't notice anything until he eeped when he felt Tonks slap the plug she had fit into his ass.

"That was a great fuck Harry, I can't wait to use you later," Tonks said with a wink.

"Now, you may be wondering what that plug is for," she said with a smirk, "It's to keep all the nice girl cum I gave you in your little sissy ass."

"Don't take it out ever, it will get ride of all the nasty business, but keep your ass nice and full of girl cum," Tonks ordered, before going rummaging through her bag again. Pulling out a couple pairs of yellow thongs, she grinned when Harry looked shocked at the items. "From now on, your only allowed to wear these thongs to show that your belong to me, a hardworking Hufflepuff," Tonks said. "Put on your first pair get dressed, and then put the rest in your trunk."

Harry did as was told to do, out of his control, his body pulled the thong up his legs, the underwear fitting snug between his new sensitive sissy ass along with the rest of his repaired clothes.

After ungrowing her girl cock, Tonks pulled her panties back up and gave her slut a slap on the ass. Relishing in the eep he let out she gave him a final order before leaving for the night. "I want you to find me tomorrow after dinner on the first floor, I'll give you an in depth tour of the dungeons," she chimed with a wink before leaving.