He jerks off in front of her.

Karen ran her hands over her large breasts as she swayed to the music. “Go ahead and take your clothes off.”

“What?!” Mr. Sawyer was so shocked, he could barely get out that one word.

“Don't be shy. Everyone knows that getting naked is an important part of endurance training. Your wife would be very disappointed in you if she found out you didn't do the training properly.”

“Oh... right.” The older man still seemed embarrassed, but he reached down and pulled off his shorts and briefs.

Karen's eyes went wide when she saw his huge cock spring free. His erection was massive, even bigger than in her fantasies where she was a stripper and he was her client. She kept dancing, but if he hadn't been so distracted by his own embarrassment, he would would have noticed her amazement.

The next song started, and it had a faster beat. Karen changed her dancing to a more energetic style, using her movements to bounce her large breasts wildly. Mr. Sawyer watched her big tits bounce around in her tight, white top and let out a groan.

“No groaning!” said Karen as she danced. “Remember, you're practicing holding out, so don't get too excited!”

“Right,” said Mr. Sawyer as Karen turned around and gyrated her ass inches from his face. “Can't... get too excited.”

“Very good, Mr. Sawyer! Now I think you're ready for the next step. It's very important for the training. You can start jerking off now.”

This time her older neighbor didn't even object. He just grabbed his hard member and began to stroke it. Karen licked her lips and stroked her curvy body as she danced to the lively music.

By the time the next song started, Mr. Sawyer was panting heavily. Karen leaned in close and said, “Now keep jerking, but make sure you don't come. This is the last part. Close your eyes and picture yourself fucking me, but don't cum for as long as you can.”

His eyes squeezed shut hard and his breathing became loud. He jerked his cock very quickly, obviously quite close to cumming.

Karen pulled her phone out of her jeans shorts. She turned off the sound and started taking pictures of her muscular, older neighbor. She walked around him, getting shots from different angles. When she had enough, she put the phone away, then put her hand inside her shorts. She bit her lower lip and fingered herself as she watched him jerk off.

Finally, Mr. Sawyer couldn't take it anymore. He let off a huge squirt of cum with a massive groan. The orgasm seemed to last forever. When he finally opened his eyes, he saw the beautiful teenager standing in front of him, clapping.

“Good job, Mr. Sawyer!” She put a hand on his shoulder and he jerked a little, overwhelmed by her touch.

“Thank you... Karen.” He panted between each word. “You've... been a big help.”

“No problem!” said the sexy redhead as she headed out the front door. “Just a couple more weeks, and you'll be ready! See you later!”