Izuku slammed the lab door. "Mei, I—it's been a full week." The last word scraped out of him, raw. Sweat already prickled across his scalp while useless green sparks of One For All flickered just beneath the skin of his arms, chasing an itch no real fight had ever given him.
I'm bothering her again… But if I don't let it out soon.. I'm.. going to lose my mind.
She spun from the workbench. Pink dreads swung. Goggles caught the light. Jacket hung open. Sports bra showed. Shorts clung to her hips. Tools clinked whenever she moved. "Baby! A full week? No wonder you're practically vibrating! Don't worry, my Overload Protocol is calibrated perfectly. You're going to feel amazing."
She never waited for an answer. She looked at the bulge in his pants and licked her lip. Heat flooded his face. The twitch under the fabric only grew worse beneath her stare.
She's never judged me. Not once. Even when I showed up shaking after Mirko tapped out at hour three.
"I tried," He kicked off his shoes in an awkward rush. "Ryukyu lasted four days this time. Said her hips were locking up. Then... nothing. I couldn't even sleep last night. Just... aching."
Her grin softened at the edges. She closed the distance and dropped her voice until the words felt private against his skin. "That's why I built this one stronger. Just for my best test subject. Stronger straps, better suction curves, auto-lube that matches your body heat. Come on, arms up."
The shirt came off first, revealing scars across his chest and shoulders. Pants and boxers pooled around his ankles. His cock came out, the head already wet. It kept swelling under her stare. She never pretended otherwise. She drank in every detail like fresh engineering data.
"Look at you," She breathed the words like praise. "So ready. Get in."
A reinforced frame dominated the center of the room, bolted down and waiting. Open cuffs lined with padding waited too. He stepped into place, pulse loud enough that he nearly missed her next movements. Quick hands locked his ankles first, then wrapped thick bands around his spread thighs. The wide strap across his torso held him upright. Finally the wrist cuffs clicked shut overhead. Steel cables sang when he tested the hold, yet nothing gave.
Safe. I'm safe here. I can finally stop holding back.
"Perfect," She took one step back to look him over. Torso, belly, and face stayed completely bare while his cock jutted out from the bound hips, still twitching. Mei lifted the main unit, a clear sleeve lined inside with soft ridges and pulsing nodes. "This part's new. Variable suction, internal rollers that mimic real squeeze, and a reservoir that won't overflow no matter how much you give it. Ready?"
Izuku swallowed once. "I trust you, Mei. Always."
One smooth push seated the sleeve over his length. Warm slickness closed around him from root to crown. Click. It locked on. She hit the switch.
The sleeve gripped tight.
"Ah~!" His skull thumped back against the headrest. Long greedy tugs pulled at him and the inner walls rippled in waves that stroked without mercy. Hips jerked on instinct but the thigh straps refused any give. "Mei—it's—hnngh~"
"First one already?" She leaned close. He could smell the faint oil on her fingers. One hand rested on the panel. "Give it to me, baby. Let it all out."
Abs drew tight. Everything stacked up across seven days simply burst free.
"FUUUCK~!" The shout tore straight from his throat as the first heavy spurt flooded the sleeve. Wet *SHLUCK-SHLUCK-SHLUCK* noises answered while the machine kept drinking every drop without pause. More kept coming, pulse after pulse, until his balls drew up hard, eased, then clenched again. A second orgasm slammed into the first before it could even fade.
"Can't—can't stop cumming~!" His voice cracked. Sweat slid down his sternum in slow trails. The machine worked him without mercy, each stroke relentless and perfect. A third peak tore through, then a fourth, leaving his cock pulsing harder inside that warm sucking tunnel. Toes curled tight. Legs strained against the cuffs until the entire frame groaned in protest.
Mei studied the glowing numbers, color high on her own cheeks. "Look at those numbers. Six-point-four liters already and you're still going. My baby's so full for me."
After the seventh orgasm she cut the power. One final tug and the sleeve slid off. His cock stayed rigid and shiny, still twitching. Izuku dragged in air, ribs heaving, vision blurred.
"Now," she said, tone gone rough, "for the field test. Myyyy field test."
Goggles clattered onto the bench. The jacket unzipped and fell away. Sports bra followed. Full, soft breasts bounced free, pink nipples already drawn tight. Shorts stayed on exactly as he preferred, fabric against his total exposure. She dropped to her knees between his spread legs. Her palms slid up his stomach, tracing the ridges of muscle, then down along his hips.
"So strong. So much power locked up in here." Lower still her hands traveled. She cradled his heavy balls, testing their weight and the way they still throbbed with leftover need. "These... god, Izuku. So swollen. All that cum, all week, just waiting for me."
She's never touched me like this before. Not after the machine. This is different.
One slow open-mouthed kiss settled on his left ball. The right followed right after. Mei dragged her tongue along the sensitive line between them, every pass hungry yet careful, heat radiating from her. When she pulled the first one fully between her lips the low hum vibrating through her sent sparks racing straight up his spine. Izuku's lungs seized for a second.
"M-Mei~ oh god that feels—"
She let it slip free with a quiet pop. Those bright eyes lifted to meet his. "They're mine now. These perfect, heavy balls. They make so much for me. I'm keeping them." One more broad lick swept across both before she worked them into her mouth together, cheeks going hollow while her fingers kept stroking the thick base of his shaft.
He shook through the long minutes of that attention until his thighs trembled. She pushed up onto her knees and slid his cock past her lips in one steady motion.
Shhlurp~
Her mouth stretched tight around his girth. Each downward glide took more than half of him while her throat opened without resistance and filthy wet noises bounced around the lab right beside the broken sounds tearing out of him. One palm cradled and rolled his balls; the other worked what her lips couldn't swallow.
"Ahhn~ Mei, your mouth—I'm gonna—again—"
She lifted off just long enough to growl, "Do it. Fill my throat, baby. I want to taste how much you saved for me."
Down she went again until her nose met his pelvis. Izuku shouted while the next climax ripped through every nerve he owned. Mei drank every surge that followed, throat flexing visibly so nothing escaped. When she finally drew back, thin strands of spit still linked her puffy lips to his wet, shining cock. She wiped her mouth across the back of her hand and grinned the same victorious smile she wore after every successful prototype test.
"Enough machine for today," she whispered. She stood, shoved her shorts and panties down together, then kicked the bundle aside. The only thing left on her was the tool belt around one bare thigh. She climbed onto the frame. She swung a leg over his lap. She wrapped her fingers around his cock and dragged the swollen head through her drenched folds.
Their stares locked tight. The playful inventor tone had vanished. All that remained was open, desperate need.
"You're mine, Izuku. Not just friends with benefits anymore. No more handing you off to whoever's strongest that week. I'm keeping you. All of you."
She dropped straight down.
That first stretch yanked a sharp gasp out of her. The restraints kept his hips locked at an angle. She sank onto every thick inch. Her walls rippled around him, hot and slippery. The moment her ass settled fully against his bound lap they both groaned at once.
She's so warm. So tight. And she's looking at me like..
"I love you," he blurted, voice raw. "Mei—it's always been you. The way you take care of me, the way you built all this just so I could be safe… I love you."
Her hips rocked once, deep and deliberate. The next roll came quicker. "Then cum inside me, baby. Fill your girlfriend up."
The word 'girlfriend' hit him hard. He yanked against every strap, trying to get closer. Mei rode harder, breasts bouncing, one palm braced on his chest and the other twisted in his damp green hair. The sharp smack of her ass against his thighs grew frantic, until it tangled with her climbing cries.
"Ah~ ahhn~ so deep, Izuku—right there—"
"Faster~" he begged, voice cracking. "Please, Mei—"
She gave it to him without hesitation. Her inner muscles clamped down on his pulsing cock as her pace turned savage. The same restraints kept him spread wide so she could grind exactly the way she wanted. When her climax crashed over her she drove down one final time and screamed.
"I-I'M CUMMING~! Cum with me—FILL ME UP~!"
White light swallowed Izuku's vision. His balls drew up tight and he came hard inside her. Mei kept rolling her hips through every spurt, squeezing out the last drops until her legs quivered and another orgasm hit her.
They stayed joined, chests heaving. After a moment her fingers found the buckles and freed each strap. The last restraint fell away and Izuku pitched forward. She caught him and eased him onto the padded mat, then tugged a blanket over them both before lying back.
He crawled half across her. Cheek pressed to her breast. One heavy arm slung over her waist. All the tension had drained from his body. Mei slid her fingers into his sweaty curls, stroking slow and tugging occasionally.
This is where I belong. Not fighting the urge every day. Just… here. With her.
"You're mine now," she murmured. Just quiet certainty. "No more sharing you with the others when the breaks get long. I'll handle every week-long overload from now on. Me and my machines and my hands and my pussy. All of it for you."
Izuku nuzzled closer. "Good. I don't want anyone else. Just you, Mei. Love you."
She kept toying with his hair, circling and scratching his scalp. His breathing evened out. One by one the lab machines powered down. Only the faint rustle of the blanket and their breaths remained.
Mei smiled against his tangled curls.
"Sleep, baby. When you wake up we'll run the numbers. Then maybe we'll test the new oral attachment I sketched yesterday. Or maybe we'll just stay right here. Either way…" She kissed his forehead. "You're not going anywhere."
Izuku answered with nothing more than a soft, contented sigh. He pressed heavier into her side and slipped toward sleep inside the circle of her arms.