Nagai-san, concerned about her chubby figure, decides to go to the gym to lose weight. She starts with stretching, but her plump body is thoroughly scrutinized at close range by the other gym members. Nagai-san gets excited and her crotch gets wet, then she is meticulously checked deep inside with a straddle pose, causing her to ejaculate. Next, the trainer grabs her "Irama handle" and vigorously pistons her before ejaculating deep down her throat. Nagai-san, spread open like a frog on the chest press machine, has a thick, raw cock thrust into her. Initially, she barely maintains her reason, feeling a mix of excitement and nervousness from the unexpected huge cock, but when her cervix is knocked and she is filled inside, she can't resist and even begs for more, receiving a generous load of cum.