The day had passed pretty quickly for both of us, and it was early evening before we knew it.
Petunia had picked up the habit of running around the house in as little clothing as possible, and if she was feeling especially frisky, she'd wear nothing at all, instead running around in her birthday suit.
This evening found her wearing a very tight and form-fitting white halter top that could barely contain her tits— which I swear looked bigger than they did when we first made out.
Either way, nothing to complain about. The black skirt she wore was equally tight and sat fairly low on her hips, barely covering the rounded globes of her ass.
Petunia had ditched panties, given how they ended up the same way every night.
We had just finished eating dinner and Petunia was busy cleaning up, so I walked up to stand behind her.
I had a perfect view of her magnificent arse as she bent over, the short skirt riding up and showing her smooth, shaven pussy.
Petunia dropped a fork, which landed on the floor, causing her to bend over the bar stool to reach it.
I reached out and grabbed her by her hips, and pulled her arse back to my growing cock.
Petunia gasped in surprise and turned to look over her shoulder, a half-smile crossing her face.
She tried to stand up straight but I pushed her down, and she put both hands on the other seats for support as I pulled her back tighter against my cock.
"Somebody's excited!" she remarked playful, grinding her arse against me.
"Just a little surprise for you," I said, and grabbed her hands.
This caused her to lean over further until the upper part of her chest and face were bending downward, with her stomach resting over the stool.
Petunia looked back to see what I was doing, and a smile crept across her face when she realized what was happening.
I immediately let go of her hips and pulled out my wand, casting a quick Incarcaerous on her wrists, cuffing them in place.
She smiled again, a bigger smile this time, her mouth hanging open as her breathing and heartbeat quickened due to her rapidly increasing excitement.
"Stand up," I ordered her, "And don't turn around until I tell you to."
Petunia lifted herself up from the stool and stood erect, her hands bound behind her by the cuffs, and nodded her head.
I pulled the stool she had been bending against and sat down.
"Turn around."
She turned around, and found my fly open, cock and balls out in plain view.
"Get me hard!"
Petunia stared at my cock and nodded again, her mouth slightly open as she tried to catch her breath.
"Yes sir!" she whispered and dropped to her knees, my commanding tone fitting right in place with her religious adherence to following authority.
My cock and balls were directly in front of her face so she didn't have to bend over to get to them.
She opened her mouth and placed it around the head, closing her lips around it and sucking on it.
She ran her tongue over and around it as she moved her head around in a small circle, and she tasted the first of my precum on her tongue.
Sliding her mouth back, she moved her lips up towards the tip, and when just the tip was between her lips she applied suction and moved her head around in small circles again, causing her soft lips to slide around the tip.
Then she opened her mouth wide and lowered it down over my cock, taking half of its length into her mouth and closing her lips around it.
She applied suction again, sliding her mouth up and down the length of my quickly-growing cock, feeling me growing harder, longer and thicker in her mouth.
"Damn, you're good!"
"Thank you, sir!" She whispered again, sucking my dick to complete hardness.
Between my excitement and her cocksucking expertise I was completely hard in no time.
The sight of her head bobbing up and down on my cock, her hands bound behind her, excited me more than I thought it would. Just then she deep-throated me, taking my entire cock in her mouth and down her throat, and I moaned.
I reached out and took her head in my hands, twisting her hair, and pulling her face further into my crotch, pushing my cock further into her mouth.
"MMMMPHH!" Petunia cried out, her eyes going wide.
I held her head there for a moment, then began to slowly face-fuck her.
I moved her head up and down my shaft in long, deep motions, not going anywhere near as fast as I had the previous day, limiting myself to a steady, leisurely pace.
Petunia looked up at me, pushed her head down my crotch, and held it there for a full fifteen seconds before she pulled back, coughing, her lips wet and shiny with her spit, her mouth hanging open as she gasped for breath.
"Stand up!" I commanded again, and she got to her feet.
"Turn around!"
She was now facing the stool.
"Bend over!"
She turned and looked back at me, then at the stool, and then at me once more before nodding and moving over.
She bent over at the waist and lay across the seat, her big tits hanging down on one side and her arse in the air on the other.
I got up and moved in behind her, cock throbbing and bouncing slightly on the way. The sight of Petunia, hands bound behind her back, bent over and helpless in front of me, her short skirt hiked up above her hips revealing her arse and pussy, excited me .
Her feet were apart just enough to give me access to her sopping wet pussy, so I put my feet on either side of hers and took my cock in hand, rubbed the head up and down between her outer lips and then pushed it inside her, grabbing her hips as I shoved it into her.
"AAAUGH!" Petunia cried out in surprise as I drove deep into her pussy with one hard shove.
Before she could recover, I was fucking her hard and fast, grabbing her hips with my hands and pulling her back while thrusting thrust forward.
Petunia cried out and moaned with pleasure as my hips smacked against the rounded cheeks of her ass, balls slapping against her clit with every forward thrust.
The smacking sounds filled the room and drowned out the squishy sounds of my cock invading her pussy again and again. Her big tits bounced and swayed with the motions of her body so violently that they slipped out of the halter one big breast at a time, hanging down below her as I continued to drill into her.
"More! Give me more!"
I complied, smacking her in the ass, making it ripple. It only served to excite her further.
I grabbed the rope connecting the cuffs around her wrists and pulled her hands back, never stopping the motions of my hips.
Petunia cried out in surprise as I yanked her forcefully, causing her to arch back, all the while slamming in and out of her. She held her head up and squeezed her eyes closed in ecstasy, moaning and crying out in time with my thrusts, her pain only increasing her ecstasy.
She was totally helpless and at my mercy, and it excited her more than anything she'd ever experienced in her entire short life.
"Oh my God, oh my God, yes, yes, yes!" she cried, grimacing with the sensations racing through her body as she was jerked around on the stool by the force of the fucking I was giving her.
"I'm gonna cum, I'm gonna cum, oh my God, I'm gonna cum!!!" she exclaimed, and a second later her orgasm hit.
She sobbed and exploded in a scream, squirting out of her pussy, gritting her teeth and squeezing her eyes shut, panting and gasping for breath, her whole body trembling and shaking with the force of her orgasm.
I felt her pussy gripping and squeezing my cock as she came, her pussy flooding with her juices.
I kept on thrusting, never slowing the motions as he thrust in and out over and over again, pulling back even harder on the ropes and raising her hands a little higher as I increased the pressure. Petunia shook with the intensity of her orgasm, and I knew it wouldn't be long before I was blowing out my load into her.
And then something surprising happened.
Petunia started to meet my thrusts midway by pushing her arse back at me.
I laughed. "That's it, Petunia!, Fuck me back! Fight me, fuck me back!"
I tugged on the ropes and drove my cock forward.
Petunia grunted loudly as she pushed herself back to meet my thrusts, trying to get me to cum. It was like she wanted— no, she needed me to cum, and badly, so badly that she was craving the sensations of my cock pumping and throbbing inside her pussy.
I wasn't sure how much more of this intense fucking she could take, so her only option was to make me cum.
And her strategy worked.
I felt my balls shifting in preparation for an orgasm, and a few strokes later my orgasm hit, my cock exploding inside Petunia 's pussy.
I threw my head back and groaned loudly between clenched teeth as I shoved my cock deep into her and held it there, and Petunia cried out as she felt me throbbing and pumping inside her.
She came too, hard and fast, crying out as her second orgasm hit.
I pulled back and then thrust forward again, shooting streams of cum deep into her pussy, and could feel her fluttering around my shaft as she rode out her orgasm.
I pulled back for a second time and then pushed forward again, not going quite as deep this time as I continued to pump inside her.
I held my hips hard against her buttocks as I finished cumming, and released my hold on the cuffs on her wrist. Her tied hands dropped down onto the top of her arse as she lay across the stool, her mouth hanging open as she gasped for breath, her huge breasts swaying with every breath.
It was all I could do to keep my balance.
My entire body was drenched with sweat and cum, and pushed my cock inside her pussy for one last time.
After I softened out, I slipped out of her pussy, gazing at Petunia laying across the stool, her back moving up and down as she gasped for breath, her hair and her big breasts hanging down in front of her face.
"Did I…" She breathed, turning to me with wide, hopeful eyes, "Did I do good, sir?"
"You did great!" I laughed, "who knew—"
The doorbell rang.