As a personal trainer, I run a private studio at a fitness gym, offering special sex training that keeps clients coming back. Today’s client, Satou, wanted to tighten her waistline. She has nearly I-cup breasts, hips over 90cm, and a soft, voluptuous figure with just the right amount of give. I had her change into a tight, sheer rental outfit, then began with stretching, gradually increasing physical contact. A damp sweat stain spread across the crotch of her tight pants as I supported her through flexibility exercises, pressing her large breasts, touching the sensitive inner thighs, and rubbing her erect cock against my back while pushing her body. During chest training, she did push-ups on her knees, sweating from her buttocks while I touched her breasts to assist. I guided squats with constant groping of her thighs and ass, and during abs training, I pressed my face against Satou’s hard, throbbing cock after she hit her limit on the fourth rep. Checking her muscle tone, I forcefully removed her bra, massaging her large breasts and stimulating her nipples. For cooldown, I kneaded her breasts while loosening her pussy muscles. I made her stick out her ass, pulled off her tight pants to massage her buttocks and loosen her labia, then removed her panties—rubbing her breasts while giving her a handjob, hugging her plump body and sucking her nipples. I massaged her from within, loosening her vagina with fingering and sucking her pussy intensely with cunnilingus. She reacted so strongly she climaxed, her abs twitching visibly. I pulled out my fully erect cock, guided her hand, and had her do abdominal training. I used handjob as arm training, making her kneel. For oral training, I made her take my big cock deep into her mouth, stimulating her throat while pressing her head down. To train her lower body, I took her doggystyle, thrusting hard and deep, continuing thrusting as she came repeatedly. I lifted her legs for missionary pounding, then sat on a chair for rear-entry sex, stimulating her clit with upward thrusts. Side position followed, thrusting sideways into her pussy, hammering her with rapid strokes before creampie ejaculation. Having injected protein earlier, I heightened the stimulation, taking short breaks before resuming vaginal training. I tormented her nipples with a vibrator, then applied it directly to her pussy, making her climax repeatedly without stopping. I entered her missionary, sucking her breasts while thrusting my hips. Then I made her ride me cowgirl style, slamming up and down, before getting on all fours, sticking her ass out for breeding piston thrusts—second protein injection, second creampie. Satou, now hooked on the gym’s unique appeal, continues training here weekly.