His little sister!

Adam couldn't believe his eyes as he watched his 18 year old sister, Cindi, walk up onto the bridge.

"Cindi!" he said as the sexy, green eyed, blonde walked towards him to give him a hug with her heels clicking on the floor.

"Hi bro!" she said as the two siblings hugged.

Cindi was a very attractive young lady who stood 5'7", just an inch less than her mother. Cindi's amazing 34DD-24-34 body was the source of many fantasies and wet dreams for both her male classmates and her teachers while in school.

The busty blonde bombshell had just graduated school and this was her first trip into deep space with her mother. Adam regretted missing her 18th birthday just last month and hoped to make it up to her at some point.

"What are you doing here sis?" asked Adam as he looked over the sexy outfit his little sis was wearing.

Normally her long blonde hair went down to almost her waist but today she had it tied up above her head. Cindi was wearing a very tight bright pink halter style top which tied behind her neck. It left alot of her back exposed along with the tops of her impressive DD breasts. The sexy top ended just below her massive mellons showing off her toned tummy and new belly ring.

"Damn. Nice bod sis." he told himself as his eyes traveled down to the dark, pleated skirt aroung her waist. It was very short and, whenever she moved, revealed the bottom of her firm ass cheeks. Adam knew she could only wear a thong or G-string under such a short and daring little skirt.

Her toned and well tanned legs looked incredible with the frilly little white ankle socks and black 4" high heels she wore on her feet.

To cap off her sexy outfit Cindi was wearing a pair of black rimmed glasses which gave her the brainy, but still sexy, naugthy schoolgirl look. Cindi didn't really need to wear glasses she just did on occasion to create the image she wanted.

Adam's cock got hard as he looked over his hot sibling and imagined Cindi and their mom frolicking in the rec room for the rest of the trip in their tiny bikinis and maybe even less.

What do they do next?