Dan stepped into the tent and saw his sister, Ashley, standing nearly naked with her shirt on her head that she was trying to pull off. Her shirt was too small for her, and she was having trouble with it, giving Dan time to take in the view.
Her full, round breasts jiggled as she moved, and her pink nipples stuck out like little cherries. Her waist was slender and her supple figure widened generously at her hips. Her pubic hair was blonde, matching her hair, and while she kept it neatly trimmed, it still appeared smooth and luxurious and Dan had an urge to stroke it.
Ashley pulled her shirt off over her head, and gasped when she realized that she had an audience. She held her shirt over her nether regions and let her long, blonde hair hang over her chest to conceal her nipples. While momentarily flustered, she quickly regained her composure.
"Hey, kiddo," she said. "You seem happy to see me."
"Huh?" Dan looked down and saw his erection bulging out prominently in his pants. He yelped a bit and held he trunks in front of him until he calmed down, which wasn't likely to happen with the image of his naked sister dancing in his head. "Sorry," he said sheepishly. "I didn't know anyone was in here."
She laughed, and seemed less embarrassed at being seen naked than he was at seeing her naked. Of course, it could have been just an act. "Yeah, I can't let you watch me change."
Dan nodded, expecting her to ask him to leave.
"Just turn around. I'll be done in a minute."
Surprised, Dan complied and listened to her change. The changing tent was small and designed for one person at a time, and the sound of fabric sliding across his sister's bare skin was driving him mad.
"You still seem pretty happy," Ashley said after she finished, noting his erection on her way out. "You might want to keep that under control."
"Hey!"
She giggled and left in a green bikini that covered her only slightly more than before. Dan scowled and changed into his trunks. His sister was always like this, teasing him, making fun of him. She was always really cool when she did it, but still, he would love to get the better of her.
He soon had his chance, because when he exited the tent, he found his sister...