Well...OK

"Come on just for a minute." Steven pleaded, "It's just us."

"Well...." Cassey replied as the busty teen looked at the cages around them, "I suppose...but just for a minute."

Steven smiled as he watched his stunning 18 year old sister reach down and pull her halter top up and over her head exposing her 37DD's to his lustful gaze.

"What a rack." he thought to himself as he licked his lips and checked out her massive mellons now on display for him.

Her breasts were full and firm with little sag under their own weight. Her pink nipples stood proudly up and begged to be licked and played with.

Cassey looked down as she hooked her fingers under the waist of her white shorts and began to slide them over her hips and down her mile long legs. The voluptuous teen then stepped out of her shorts before tossing them with her top leaving her only in her tiny pink thong and sexy white pumps.

"Nice." Steven stared as he looked over his baby sister's perfect body, "You really have a nice little bod."

"Thanks bro." she said as she placed one leg in front of the other and put a hand on her hip.

Steven's cock slowy began to get hard as he looked over his sister's little thong covering her pussy. The tight material just barely covered her smooth slit and formed a nice camel toe over it.

The room was quiet as the monkey like creatures and Hugo stopped moving about as they looked over the two humans.

"Well?" Casey said as she looked over her big brother's muscular body standing before her.

"Oh..." Steven replied as his sister's voice brought his attention back to her face, "well why don't you have a seat." He motioned for her to sit on a nearby table.

Cassey smiled as she turned around and walked over to the table saying, "Oh now you want me to sit on the table?"

Steven smiled as he checked out her little thong running between her firm butt cheeks as she strode towards the table.

"Err...yeah." he managed as he looked over her shapely legs in her sexy heels.

The stacked 18 year old sat on the side of the table and placed hands down on the edge.

"Now what?" she asked as she saw his erection starting to grow again.

"Just relax." he answered as he walked up directly infront of her and reached out to cup each breast in one of his hands.

"Oh!" she said in mock surprise as her big brother began to fondle and squeeze her massive mams.

"Damn you have one hell of a nice rack." he said as he lowered his mouth to one of her erect nipples and began to suck on it.

"Mmmffff." was all she could manage as Steven's hands and hot mouth worked over her sensitive nipples.

"That feels so good." she told herself as her body began to respond to her brother's touch.

Suddenly she felt Steven's hands on her thighs as he began to spread her legs apart.

"Steven..w-what are you doing?" she asked as she realized just the thin material of her tiny thong was covering her wet vagina.

"Just relax and enjoy." Steven repeated as he knelt down between her legs and ran his tongue over her thong panty.

A jolt of electricity ran through her body as she felt he brother's mouth over her thong covered pussy.

"It's...it's OK." she told herself as Steven began to work over her thong covered pussy with his mouth, "I'm still wearing my panties. It's not like anything could happen...."

Slowly Steven reached up and began to pull Cassey's thong to the side exposing her completely shaved little slit.

"Oh no...we mustn't...we can't..." she began to protest as she felt her big brother's tongue now sliding along her wet slit.

Cassey's protests quickly stopped as Steven's tongue quickly found her clit and began to work on it. Slowly he slid a finger along her smooth slit and began to rub it against her clit too.

"Oh God Steven." the 18 year old moaned as a multitude of new feelings began to course through her young body. "It wasn't as if they were having sex or anything." she told herself. Afterall this is just like 'playing doctor' and couldn't be considered something as taboo as ****.

Steven slid his finger into his sister's tight snatch only find some resistance.

"Uggg..you better stop...." she gasped as Steven realized that it was Cassey's still intact hymen. She was still a virgin!

What do the two hot siblings do next?