As a personal trainer, I run a private studio at a popular fitness gym, specializing in a unique training method that stimulates female hormones and keeps clients coming back. Tanaka-san, who booked with me for the first time, is an older sister who came on her friend's recommendation. Since she didn't bring workout clothes, I have her change into rental gear. She notices her white tight pants are see-through and murmurs, "Um, these are kind of transparent..." I explain that the custom tight pants are designed to clearly show the panty line and pussy muscles—since it's a professional setup and no other clients are around, she shouldn't worry. She accepts this, and we begin training. First, squats. I check the tension in her thighs with my hands while admiring her sheer tight pants. Her filthy, sexy hips make my cock twitch and grow hard. Next, sit-ups. She struggles after just three, so I support her by holding her hands. Each time I pull her up, my bulge presses against her face, and she shyly turns away. I say, "You know... this feels kind of close," and turn her face toward me. We move to stretching—raising her arms overhead while standing. "Yes, stretch your chest up~" I press my bulge against her ass and grope her breasts and sides freely. Lying her down on the mat, I have her do leg raises and flexibility exercises, massaging her ass, then spreading her legs wide to make her feel embarrassed. "Your body is very flexible." "It's just... kind of embarrassing..." "Don't worry, that's what personal training is for." I have her get on all fours, lower her upper body, and assume a cat pose. Her sweaty pussy muscles become clearly visible. "Your pants seem pretty tight." I try pulling them aside, but she still resists. I make her sit on the mat with legs spread, arms raised, stretching her upper body, then press my body tightly against her from behind. "Your bra seems tight." While touching her chest, I slide off her bra, exposing her bare tits. "Eh, it's not that bad..." "Come on, push your chest out—your muscles aren't showing otherwise." As she takes deep breaths, I massage her naked breasts, stimulating her nipples. "Nnnn..." I stretch her legs open, press my hand against her pussy, and rub it firmly. "You're really heated up. Let's loosen it and cool down." I flip her onto all fours, pull her pants off, and start sucking her pussy with intense cunnilingus. "Stop, please, teacher... Ah!" "You need a massage." I finger-fuck her until squishy, wet sounds fill the room. "Aaahn..." "Now, let's do abs. I'll take my clothes off too." I guide her hand so her face hovers right over my bare cock. After a few repetitions, she starts licking the tip with her tongue, then slurps it into her mouth with wet, juicy sounds. "Yes, shake that ass!" I kiss her deeply, sit on a chair, and take her in a face-to-face seated position, thrusting my cock inside. "Eh, that's not allowed..." I suck her tits while violently pounding her pussy. "Ah, ah, ah, ah!" "Now you try moving." I switch to rear entry, making her grind her hips, then keep her on all fours and have her move herself in doggystyle. "Ah, ah, it feels good." Gripping her hips, I slam into her harder and harder until her body convulses and she cums intensely. I keep pressing deep, "training" the inner walls of her pussy, and she pushes her hips back, squeezing me tightly. Switching to missionary, I have her lift her hips and move on her own—great for abs. "Ah, ah, ah, it's good..." "Time for protein injection." I tongue-kiss her wildly while thrusting, then creampie her deep inside!