Kotoha stood at the edge of the mattress, completely naked.
Her twin tails quivered with every tiny shift of her body. Her cheeks glowed a deep crimson, the blush spilling down her neck and across her collarbone.
Her chest rose and fell in quick, shallow breaths, her perky, soft breasts bouncing faintly with each inhale. Her nipples were already stiff, flushed pink, a clear sign of how easily she responded to me.
Her arms hung at her sides, fingers twisting nervously, unable to hide the way her thighs pressed together, glistening faintly in the dim light. She bit her lower lip, eyes darting between the cuffs fixed to the headboard and me.
"…Souta-kun. What should I do?"
"Lie down."
She obeyed, climbing onto the sheets. I took her wrists and fastened them into the padded cuffs. The click of the locks made her whole body tense.
"…I can't move anymore…"
"How does it feel to be cuffed?"
"Since Souta-kun is the one doing it… I don't mind it. This is pretty exciting…"
She rubbed her thighs together as her voice grew hazy.
"Souta-kun… hurry…"
Her nipples were stiff, standing proudly. I pinched one between my fingers, twisting it lightly. She let out a load moan, arching into the touch.
"Is it sensitive?"
"Y-you've been playing with it this entire week… I can cum with just my nipples now…"
"Should we put it to the test?"
I flicked her nipple lightly.
"Ahh… Souta-kun… I can feel it all the way down there… nghh…"
I bent my head and caught the other nipple in my mouth, sucking hard. She trembled, her legs kicking against the sheets, juices slicking the inside of her thighs.
"Ahhh! It's too much! My chest… I can't… nghhh!"
I alternated between pulling, rolling, and biting, watching her writhe helplessly in the cuffs.
Each time I changed rhythm, her pussy clenched hard enough I could see the wetness glistening between her spread thighs.
"Souta-kun! I'm gonna… ahhh… I'm gonna cum… just from my nipples…!"
Pinching both buds at once.
"Do it."
Her entire body seized. Her back arched, arms straining against the restraints, twin tails whipping against the sheets. Her pussy gushed clear fluid onto the bed.
"Aaahh!! I'm cumming! From my nipples..! Nghh!♡"
She convulsed again and again, nipples stiff between my fingers and teeth, until she finally collapsed. Her chest heaved, her face dazed, sweat dripping down her flushed skin.
"…I came… so hard… Souta-kun…"
"Your body has become lewd, Kotoha-chan."
"It's all Souta-kun's fault…"
"If anything happens, I'll take responsibility."
"…Okay…♡"
I reached for the nightstand drawer. Inside was a small bottle of clear lube. I held it up for her to see.
Her eyes widened, and her legs pressed together instinctively. "T-that's… for my…"
"For your ass."
I squeezed a line of lube over my fingers, letting her watch it glisten.
"I want to use your ass, Kotoha. What do you think?"
She shook her head faintly, twin tails brushing the pillow, but her voice betrayed her arousal. "…Souta-kun… I-I can't say it…"
She spread her legs voluntarily. "…Please.."
"Good girl."
Kotoha lay cuffed to the bed, her hips trembling as I spread her ass wide and admired the view.
Her blush deepened as the cool air kissed her bare pussy. "Ahh… nghh… Souta-kun…"
Her cheeks were round and perfect, soft flesh that filled my palms. Between them, her asshole twitched faintly, a delicate pink star that clenched and relaxed.
I slid a pillow under her hips, raising her up so her ass tilted beautifully toward me. The new angle made her cheeks part more, exposing every detail of that trembling little ring.
I uncapped the lube and let it drizzle slowly down her crack, the clear liquid running over the curve of her ass before dripping onto her rim.
Her body tensed, arms pulling against the cuffs.
"…It feels weird…"
"Relax. Breathe. I'll put my finger in." I pressed gently, just enough to feel the tight ring resist me.
Her eyes squeezed shut, her voice small.
"…Okay… I'll try."
With slow pressure, I eased my fingertip into her. The resistance gave way, and I slid in halfway, feeling her tense around me.
"Ahhh…! It's stretching…!♡"
"This is my second time putting a finger inside your ass. How is it compared to the first time?"
"Hnng… if you ask like that… how am I supposed to answer..?"
"Well?"
"W-well, the first time… you were licking me, so I wasn't really thinking about it…"
"And now?"
Her hips trembled, her thighs shaking against the sheets. "Nnghh… ahh… Souta-kun… it's strange… but… it makes my pussy throb too…"
"You're truly a lewd girl, Kotoha."
"Yess… I'm a lewd girl for Souta-kun…♡"
I admired the sight.
Her ass clenched tight around my finger, the rim twitching with every shallow push.
The lube glistened as it smeared across the small, puckered ring, stretching just enough to take me in before squeezing back with desperate resistance.
Her hole looked flushed, trembling with every pulse of her body, the soft skin around it quivering from strain.
When I pressed deeper, her rim stretched wider, the slick shine of lube catching the light as it coated the delicate folds. Each slow withdrawal left her hole gaping slightly, struggling to close, only to flutter and pull tight again as if begging me not to leave.
"…Ahhh… Souta-kun… I think… I'm close again…"
Kotoha's asshole was her most sensitive spot. The only training it needed was stretching so it could accommodate my size. Even without training, she could cum just from my fingers.
I pushed my finger back in and pressed firmly against the inner wall, rubbing in steady circles. Her back arched hard against the cuffs.
"Cum then. Cum while I finger your ass."
Her whole body tensed, her pussy clenching, nipples stiff. "♡Aaaaahhh! I'm cumming—! From my ass—ahhhhhh!♡"
Her body convulsed, juices flooding the sheets as she came harder than before, ass tightening desperately around my finger. She thrashed against the cuffs until the orgasm dragged her limp, leaving her trembling and breathless.
I slid my finger free, watching her body twitch from the loss. Her eyes were hazy, her face covered in sweat, lips parted as she gasped.
"…Souta-kun… I really… came from that…"
Kotoha lay limp in the cuffs, sweat dripping down her flushed skin. Her chest rose and fell in sharp bursts, nipples still stiff from the week of training. Her thighs glistened, her pussy soaked, juices spreading across the sheets.
"Did it feel good?"
Kotoha blushed and looked away, trying to hide her face in the pillow.
"Of course… of course it did…"
"Good girl. I'll make you feel even better."
"T-thank you…"