He stood in his bedroom on the second floor, hidden behind the mirrored glass, watching them swim in his pool, knowing they couldn't see him watching. It was a delicious sight, the mother and her two daughters from next door, their lean bodies lithely gliding through the water with their skimpy bathing suits and dark tans.
He watched the oldest girl get out of the pool and dry off, followed by her mom. They slipped on their sandals and disappeared through the gate to their own house on the other side of the 8 foot high privacy fence and the hedges.
He held his breath, waiting to see if the eighteen year old little sister would follow suit. She stared after them for a moment, then resumed swimming, diving under the water. He watched her surface, her shoulder length brown hair glistening and dripping, a smile playing on her delicate lips.
When she reached the edge of the pool, she started to climb the ladder, pausing for a moment to reach behind and adjust the bottom of her suit. Even from where he stood, with his erect cock straining against the material of his pants, he could see the water beading up in dots on her well-oiled skin, the nipples of her small pert breasts hard underneath the thin material.
She walked towards the house, moving out of sight and a moment later he heard the doorbell ring. He smiled, pulling his shirt down over his pants, hoping his hard-on wasn't too obvious, and went down the stairs to open the door.
She was shivering a bit in the shade of the house, her arms folded across her tight bare stomach, pushing up her firm young breasts.
"Hi," she said a little shyly. "I was wondering if I could borrow a towel. I forgot mine at home and was hoping I wouldn't have to run home to get it."
"Oh, no problem at all," he said genuinely, looking down into her beautiful brown puppy dog eyes. "Come on in."