【瞬き厳禁】爆乳ランニング！フル勃起不可避！？ぶるんぶるん縦横無尽に激震するおっぱい！！Core

【瞬き厳禁】爆乳ランニング！フル勃起不可避！？ぶるんぶるん縦横無尽に激震するおっぱい！！ Don't you have a desire to peep on a city girl with high beauty standards doing her training?

This time's customer: Kanna, 27 years old, dental assistant

This time, we invited Kanna, a super high-spec beauty with massive tits.

"Would you like to try a free experience of the latest sports science training from Stanford for ideal body shaping?" After the first free session, she left a harsh comment saying "too familiar," but I sent her a sales DM anyway, and surprisingly, she replied OK...!

On the reservation day, I was excitedly waiting, and Kanna showed up in a mature long skirt and floral long-sleeved shirt. Even through her clothes, her overwhelming massive tits are obvious...!! If you pass by a woman like this, every guy in the world would definitely stare. But there's a bit of a guarded vibe from the previous session... For a woman who wants to be beautiful, the magic words "latest sports science training" are all I can use to push her forward.

[This Time's Free Experience Training Menu]

[1] Body Balance Check

[2] Balance Ball

[3] Dumbbell Press

[4] Back Handstand

[5] Ab Roller

[6] Running Machine

[1] Body Balance Check

Before starting the latest sports science training, we use an irradiation device to analyze the body's constitution and balance, checking overall balance like muscle mass, bone mass, fat, etc.

We apply the irradiation device over Kanna's casual clothes to measure her body balance, but as usual, we use the excuse of an error in the device to say, "Would you mind getting down to your underwear?" She naturally shows some resistance... but after explaining, "Everyone does it," she reluctantly agrees to strip.

Kanna changes into her purple underwear, and damn, they're huge...! Today's course is all about enjoying these tits, so at this point, my crotch is already swelling with anticipation (lol).

"Okay, let's measure again like this!" I say, applying the device. It reacts properly, so naturally, I say, "I want to measure your upper body more," and carefully apply it around her chest. I sandwich the device in her cleavage or have her push her tits together and shake them... Unnecessary actions are passed off as "for measurement," and it succeeds without suspicion!! My dick is reacting to Kanna's massive tits, but if my erection gets noticed, it's bad, so I desperately hold back. After finishing the measurements, she changes into training wear, and training begins.

[2] Balance Ball

We start with the balance ball to warm up the body while doing core training. She bounces on the balance ball, and her tits shake violently up and down! Even in training wear, the intensity makes it seem like they're about to spill out...!! When she clamps her arms around her chest and places her hands on the ball to bounce, the shaking gets even more intense—it's simply spectacular. I'm fantasizing about having her ride me cowgirl style when I accidentally ask her weirdly, "Do you get asked to do movements like this often?" She doesn't reply... The silence makes me break out in a cold sweat (sweat).

[3] Dumbbell Press

She lies on her back on the bench holding dumbbells for chest muscle training. When I touch the upper part of her chest, she shows some resistance. But I say, "I'm just touching to make you aware of your chest muscles, so don't worry," and continue the training. After she gets a bit tired, we take a break. During that, under the pretense of loosening muscles, I touch her chest, but she almost swats my hand away (sweat). So, I have her loosen it herself, and watching her shake her own tits is the most erotic thing...!!

[4] Back Handstand

Next, we lay out a mat for back handstand. This scene is burned into my eyes even now, and I probably won't forget it. I've never seen anything like this!! The moment she does the back handstand, Kanna's massive tits sag toward her face (downward) due to gravity, and their size is insane...!! While assisting, I'm fully erect and desperately hiding it so she doesn't notice (sweat).

[5] Ab Roller

Next is the ab roller. Her massive tits coming toward the small camera—it's intense here too!! Watching her work hard, I can't stay still, so I kneel behind her ass. It feels just like doing her doggy style—pure bliss—but she turns around confused, saying "Eh...?" But my engine is already revved, so I make excuses like "for training" and continue. Afterward, we do some shoulder stretches. Wanting to see her massive tits, I only specify stretches in all-fours position (lol).

[6] Running Machine

We start with walking warm-up to heat up the body. Since it's Kanna's first time on the running machine, her walk is awkward at first, but she gradually gets used to it. So, I increase the speed to a light run. As expected from Kanna, her tits are already bouncing wildly...!!

Under the pretense of checking her condition, I stare at her tits from the front, side, and looking up from below... I succeed in gawking from various angles!! It's all captured up close with the glasses camera, so please check this scene in the main video—her tits shaking so hard they're about to burst out of the training wear is insane... (lol)

After warming up enough, I try measuring with the irradiation device, but it errors, so I stop the machine once. Then, I suggest, "The training wear is getting in the way, can you take it off?" She replies, "I have nothing on underneath..." which is totally reasonable. So, I say, "I'll stand behind so I can't see," and push her to strip. Hesitant, Kanna takes off the training wear. Finally, the moment I've been waiting for arrives...!! Lol, Kanna is now topless, exposing her massive tits...!!

In this state, we restart the running machine. Once warmed up, I apply the device to her back, and unlike before, it measures properly. Then, still behind her, I apply it to her chest area. But it errors again... So, I say, "From behind, the angle is bad and it's not measuring, so I'll go in front," ignoring the promise and moving to her front (lol).

Kanna looks extremely surprised and covers her chest with her arms. Reluctantly, I apply the device, but I really want to see her tits...!! So, under the pretext of measuring her chest properly, I pull her arms away. She resists a lot, but I list reasons like "Everyone does it" and "Moving on the running machine is dangerous," succeeding in making her run with her tits fully exposed!! Not satisfied with just applying the device, I lift her tits from below with it—they're so heavy...!! I've never felt tit weight like this, so in excitement, I do it multiple times. After measuring, under the guise of "checking if your body is warmed up," I touch her chest. She tries to resist, but I say, "Letting go of your hands is dangerous," and grope her massive tits like crazy!! They were incredibly soft, and it was truly blissful... (lol)

At this point, I'm fully erect, even leaking a bit of precum from excitement... There's no chance to see tits like this up close, so while staring, I ask, "Can you do a bit more?" but she says, "No, that's enough," clearly wanting to stop. Wanting to grope more, I go behind her and squeeze her tits from the back with both hands. She tries to cover and resist again, but I brush her hands away, saying, "Letting go of the machine is dangerous," lifting and kneading her tits. Finally, she gets angry and emergency-stops the machine, ending it there...

[7] Jump

Finally, jumps for cool-down. Since her body is warmed up, we do jumps just like that. Without training wear, her tits bounce up and down like crazy...!! And unable to hold back, I finally... .

I think there are many men who love tits. Among them, they divide into "big tit faction," "small tit faction," "beautiful tit faction," etc. I consider myself "beautiful tit faction." But these massive tits have destructive power that makes factions irrelevant!! In fact, since groping Kanna's massive tits, I watch the footage from that time every day and jerk off to it (lol).

I really want everyone to see it!

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■Bonus Footage■ (Limited to purchases before 24:00 on November 3, 2025)

We present footage of the changing room after training.

Please enjoy!

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[Video Details]

★Main Video

Angle: Glasses camera + multiple small cameras

Playtime: 33 minutes 45 seconds

File size: 2.6GB 4K 3840×2160

★Bonus Footage

Angle: Small camera

Playtime: 1 minute 40 seconds

File size: Approx. 130MB 4K 3840×2160