As a personal trainer, I run a special stealth sex training program in a private fitness studio, significantly increasing repeat clients. Yamada, who came by word of mouth for the trial session, arrived with a pure and innocent aura, yet gracefully committed to the workout while maintaining her feminine figure. After changing into our sheer tight rental gear, we began training. Squats are a crucial exercise to learn proper muscle engagement. With her arms locked behind her head and hips sinking deep, her form was pure eroticism. The tight pants revealed the beauty of her panties, captivating even Yamada herself. Next came abdominal training, an area many women struggle with. I gently pulled her up, guiding her face close to my crotch. "C-close..." I intertwined seduction with my role as a trainer, tightening her muscles. Laying her on the mat, I positioned her into an embarrassing pose, touching her large ass for support. She visibly reacted to the sensation. "Now, let's check your full-body muscle condition." I had her kneel, groping and massaging her breasts, adjusting training based on their softness. "U-um... a little..." I deepened the seduction as her trainer. "Feel free to speak up if anything bothers you." "N-no... I'm fine." At that, I removed her bra, sucked her nipples, and exchanged deep, passionate kisses. "W-what if someone comes in...?" Reassuring her it was a fully private room, I calmed her nerves. Laying her down, I rubbed her crotch through the tight pants, then slipped my hand inside her panties, fingering her relentlessly. "Aaaah!" Reacting to her moans, I flipped her onto all fours, pulled off her panties, and devoured her smooth ass with my tongue, intensely eating her out. "Ah, s-stop, sensei, I can't!" In response, I flipped her over and used my fingers to stimulate her slick, soaked pussy. "Ah! Ah! I can't, I'm cumming!" She convulsed and climaxed. Riding her reaction, I deepened the seduction and moved on to oral muscle training. Standing firm, I made her take my bare cock into her mouth, performing a hands-free blowjob. "Use your tongue and stroke back and forth." She obediently pleasured me, lost in pleasure, before returning to ab training. Each time I pulled her up, I made her suck my cock, deepthroating her until it hit her throat. "Now, let's finish by training your entire body." I laid her on the mat and thrust my cock deep inside her in missionary. "S-sensei, this is wrong! Ahh..." I pounded her sopping wet pussy rhythmically, filling it with deep, squelching thrusts. "Ah! Ah! Ah! Ah!" I groped her bouncing breasts, swapping tongue kisses while fiercely assaulting her inner depths. Sitting on a chair, I guided her into cowgirl position, instructing her to ride my rock-hard cock with pounding motions. "Ah, no, I'm cumming!" Her ass twitched and spasmed as she climaxed. Gripping her buttocks, I made her grind back and forth in rear entry, performing squats while violently thrusting into her already-orgasming pussy. I had her grip a stability ball, taking her doggystyle while she braced herself. "Keep the ball steady, now." "Haaaauuuu~!" Her pussy tightened deliciously as she struggled to maintain posture, so I varied my angle and kept thrusting. On all fours, I pounded her from behind as she screamed in pleasure. "Haaau, it feels too good!" Pulling her arms, I slammed into her relentlessly, then laid her on her side and continued thrusting in spoon position. Flipping her over, I ate her pussy with cunnilingus until she came again, then re-entered her in missionary. "Aauuugh!" At her reaction, I said, "The more you cum, the tighter your body gets." I lifted her up, making her squat on my cock in cowgirl, then returned to missionary for intense piston strokes. "I'm injecting protein now." I pounded her pussy violently, erupting deep inside with a thick creampie of hot cum. "Today's trial session ends here. Please register as a full member." "Yes, I understand." Yamada, now addicted to sex training, began visiting weekly.