Shinji and Belly practice patience with Mari

This is story of them xD

Today, Mari had taken it upon herself to help Shinji “train his abdominal endurance” through boxing. They agreed to meet at a private gym ring—completely isolated, no one around to interfere.

After arriving, the two quietly changed into their gear: gloves, mouthpieces, and boxing clothes. Shinji’s equipment was a cool blue, while Mari’s was a playful pink.

As Shinji stood by the ropes, Mari approached him with a mischievous grin.

Mari: “Shinji-kun, all set~?”

Shinji: “Y-Yeah…”

Mari: “Since no one’s watching… stay still, alright? Don’t resist~”

Without warning, Mari slowly peeled off her top layer of clothes, revealing only a black sports bra beneath. Shinji’s eyes widened just before Mari reached over and pulled off his shirt—exposing his soft, flat stomach.

Shinji: “H-Hey! What are you doing!?”

Mari: “Just stripping you down a bit I want clean shots at your belly”

Shinji: “Then why… why are you stripping too!?”

 Mari: “It's hot in this gear, you know Don’t sweat the details”

Without another word, Mari moved behind Shinji and gently wrapped her right arm around his torso, holding him in place.

Shinji flushed immediately—feeling her so close, pressed against his back.

Mari: “Alright. Brace your abs, Shinji-kun~”

Shinji: “…Okay…”

Mari’s gaze trailed down to his abdomen. Slowly, she began to swing her left arm—testing the momentum. Shinji’s eyes locked onto her movement. Then—

WHAM!
Her fist sunk sharply into his stomach.

Shinji: “Urgh!”

The punch forced a jolt through his body. Spit sprayed slightly from his lips as the shock hit him—he hadn’t expected that much power from her. But he gritted through it, clenching the mouthpiece tightly.

Mari pulled her glove back, revealing a faint red dent on his belly.

 Shinji: “Hah… hah…”

Mari: “Wow Your tummy’s so soft~, Shinji-kun. Just one punch and it’s this squishy Time for some combos now~”

Without giving him time to answer, Mari launched a flurry of rapid left jabs—each one pounding directly into his gut.

WHAM! WHAM! WHAM! WHAM! WHAM! WHAM!

Shinji: “Mmm! Mmhh! Mmgh!”

Spit burst from his mouth with every strike. His mouthpiece started to jut out, mixing with saliva that dribbled down his chin. His eyes squeezed shut, body trembling as he endured the onslaught.

Finally, Mari stopped.

She pulled her glove away again—his stomach now marked with deepening red bruises. The moutpiece hung loosely from his lips, nearly slipping out. Drool clung to it, and tears welled at the corners of his eyes.

His breathing was ragged and visible.

Mari: “Oooh Looks like you’re hitting your limit, huh? Then… let’s make this last one count!”

She pulled her left arm far back, winding it like a spring. Shinji’s eyes widened with fear as he shook his head and tried to resist—desperately twisting to escape.

But it was too late.

SPLASH!!
Her glove slammed one final time, deep into his stomach.

Shinji: “Aghhh…!”

His entire body jolted as the force sent his mouthpiece even further out, causing a gush of drool to burst from his mouth. His eyes rolled slightly, body trembling as he staggered.

But Mari caught him.

Her right arm stayed wrapped around him, preventing his collapse. She leaned closer, face hovering by his, studying him with a curious smirk.

Her own mouthpiece jutted slightly, saliva dripping freely down her chin.

Mari: “Hehe That’s enough for today, Shinji-kun. You did so well~”