I work as a personal trainer, supporting clients at a fitness gym. My favorite word is "Muscle!" For motivated, enthusiastic clients, I offer a special sex training menu and homemade protein injections, and I've been gaining repeat customers. Today, a very distinguished client named Ayano Kato came in—someone who's been regularly attending the gym and recently decided to book a personal training session. When I asked about her workout attire, she replied, "I didn't bring any since I saw rental was available." So today, I provided her with gear free of charge. She changed into the tight-fitting training wear, clearly self-conscious about how much her underwear shows through. I asked if she'd like to reschedule with her own gear, but she responded, "I'll do my best!" Choosing slimming over shyness, her determination is strong. We start with squats, crucial for lower body training. "Yes!" she responds. I count ten reps, shouting "Muscle!" with each. On the ninth rep, I stop as she lowers her hips and check her muscle condition. While she holds the difficult pose, I aggressively massage from her inner thighs to her buttocks, spreading the flesh. "Your butt feels kind of loose." We switch to abdominal training, doing several reps. "You look pretty exhausted—let me help." I grab her hands and lift her up, forcing her face directly into my bulging crotch. Startled by the sudden proximity, she turns her face away. "I-It's too close!" "Don't be shy! Muscle! Muscle!" I violently pull her hands, intensifying the crunches as my cock throbs harder. "Ah, it's too tough!" "Then let's stretch your hip joints." I lay her on the mat, make her spread her legs herself, and open her into a vulnerable M-shaped split. "I-It's embarrassing!" "Can't you open wider?" I press down on her legs while using my thumb to apply pressure to the sensitive area near her pussy. "Ah!" When asked if she can open more, she gasps, "This is my limit." "Then I'll assist." I force her to rest her head on my cock pillow while I push her legs wider, stretching her in this humiliating pose. "A-Are other clients doing the same thing?" "Yes, you'll get used to it." I make her assume the cat pose, sticking her ass out for lower back stretching. I press down on her hips with both hands, kneading her ass cheeks intensely—her ass is so good I want to fuck it immediately. "Haaah… it's so intense…" "Are you married?" "I broke up five years ago." I continue pressing and teasing the sensitive lines around her pussy, spreading her open. "Now let's check your pectoral muscles." I make her sit in a wide straddle, then massage from her sides up to her décolletage and finally her breasts. "Ah, that's my chest…" "I'm checking your pectoral development." I aggressively squeeze her soft, large breasts, pull her bra aside, and stimulate her bare nipples. "Aaah, is this part of training too?" "It's personal training, after all." "But still…" While groping her bare tits, I rub her pussy through her tight pants in the M-split position, then slide my hand inside. "S-Stop…!" When I finger her bare pussy, it squelches wetly, soaking through. "Your inner muscles are really tense. Let me loosen them up." I remove her tight pants and give her a finger massage in the M-split, pussy juice dripping heavily. "I'm so wet—what's happening to me?" "Sorry, I don't know." "No help for it. Now, let's move on to abdominal and oral training." I pull her hand and force her to take my bare cock into her mouth. Pulling her head back and forth, I make her perform a rhythmic, pleasurable deep-throat blowjob. Then, on all fours, I make her suck my cock all the way to the base while I grope her ass. "Now, we'll use this to loosen your inner muscles." "Wha—?!" From behind, I slam my rock-hard, thick cock deep into her pussy, pistoning to loosen her stiff vaginal walls. "Aaaaah, wait…!" I press her head into the mat, grab her lifted ass, and pound deep into her pussy. "Aaaaah, no! Stop!" "Good job, Kato—you're sweating nicely now." I lick the sweat from her ass cheeks and switch to machine-assisted standing doggystyle for sweat-inducing sex. I suck her sweaty tits while fiercely thrusting into her pussy. "Aaaaah, sensei… I'm cumming!" "Now, oral training again." Not circuit training—but circuit sex. I make her give me another blowjob, then switch to missionary-style cowgirl, making her ride me. "Don't just move up and down—sway forward and back too." Her sexy pussy grinds and milks my cock with sensual hip movements. Then, spooning her, I hammer her cervix relentlessly. "Sensei, no, no more! Aaaaah!" Her abs spasm violently as she cums hard. I switch to missionary, rubbing my cock against her quivering pussy. "What do you want? This?" "I-I want it." I bind her legs together and pound deep into her pussy, making her moan wildly. "As today's reward, I'll inject you with protein!" I fiercely thrust into her open M-split pussy and creampie her with a raw cumshot. "Book your next session—we'll continue soon." "Yes, I'll do my best." And so, Kato released five years' worth of vaginal detox and became a repeat client.