Watching my niece (part 1)

I'm a 35 year old divorced realtor.
I own my own business. I'm Ryan. I shop at BIG and Tall. I'm 6'2" and a thick 220. My daughter Cara lives with me. She's going through her stages of being Emo, Goth, Straight, Lesbian.... but she is naturally beautiful. She looks like her mother who won many padgents. My brother called me to ask if his daughter, my niece Zoe who's 17, a senior in high school and got suspended for a week could stay with us since I have a flexible work schedule.
Of course I told him.
So he brought her over that same afternoon. Zoe is a petite girl. Barely 100 pounds and only 5'1". She's a natural redhead with porcelain skin. Her green eyes are mesmerizing.
She came running up and jumped in my arms. As she wrapped her legs around my waist and her arms around my neck. I didn't think twice about it. As she nicknamed me "Uncle Ry-bear"
I picked her up and hands her a bear hug. I caught a glimpse of her dad's face and he wasn't happy. I set her down on her feet and called Cara.
Cara came and greeted her uncle then her and Zoe headed inside.
As my brother filled me in on the reason she got suspended. She broke into the principals office and announced over the system that the coach was molesting his team.
I chuckled and asked if it was true. He nodded yes. That Zoe had text where he was asking for nudes.
I say there in the garage trying to act appalled but I was turned on at the thought.
Actually I have never thought about young girls sexually before. Especially not my family.
I assured my brother that I would keep her safe and keep her busy since my daughter wouldn't be around much with her sports and tutoring.
After dinner the girls went swimming and I sat on the deck doing some research on my phone. Zoe wore a skimpy string bikini that showed her small tits. Which were mostly all nipples. Cara wore her more modest bikini that showed off her curves.
Cara got a phone call from her on-again-off-again boyfriend so she headed inside as they argued.
Zoe swam over near me and she splashed me.
I put my phone down and pulled my shirt off then dove in the pool. I swam up to her and pulled her under.
She squealed and started a splashing war. I grabbed her and wrapped my arms around her small body.
She stopped squirming and I felt her hips arch back into my crotch. I froze. Not really sure what to do.
She pushed her ass back against me again and she ground against me.
My cock reacted. It started to get hard. She kept grinding.
Cara opened the door, I released Zoe and tried to act normal which I looked completely guilty as fuck.
She dove in and her and Zoe began handstands and flips. I told them they needed to come in soon so I could lock up. Then I headed in to shower.
When I was in the shower I felt a rush of cool air which meant the bathroom door opened.
I shouted "I'll be out in a sec". I continued to shower. I felt someone touch me.
I jerked and saw Zoe. Standing in my shower completely naked. As my eyes slowly roamed her small firm body. Her small titties which was mostly nipples. But her nipples were hard and long. Her tight toned stomach wich looked like soft porcelain that lead down to her pussy. She had more hair than I would have thought.
Her pussy hair matched her red hair.
I looked back at her breathlessly beautiful face. Her smile and those emerald green eyes was intoxicating.
I shook my head as if I was dreaming.
But she ran her fingers along my arms as she stepped closer. Her small stature was even more evident against my massive frame.
I stepped back and started to lecture her. But she stepped to me. Her small hand reached up to my lips and "shhhhhh" as he other hand grabbed my cock. Which was now rock hard. I froze as Zoe kissed my chest, she sucked my nipple as her small hand wrapped around my shaft. Her small fingers couldn't wrap around it. She began to stroke as her mouth kept my nipple hard against her tongue.
I was elated, I was so turned on. I had never thought of her as sexy but she was turning me on more than I had been in a long long time.
As her fingers encircled the head of my cock she moved her mouth to my other nipple.
I reached out and grabbed her by her wet hair. I pulled her face into my chest as she sucked my nipple harder she moaned.
I came back to reality and I released her. She took her mouth off my nipple and her fingers stopped caress my cock.
Her green eyes glared up at me as the shower fell like rain on her skin.
"Do you not want me to make you feel good Uncle Ry-bear?" Her face glowing with her red hair shiny as it flowed down her shoulder.
"No. I mean. It's not right" I stammered.
Her fingers then pulled her wet hair away from her face. She turned, grabbed the loofah. I stood watching her wash her hair and her arms. As she bent over to wash her legs her firm perfect ass against my raging hard cock. She giggled as she wiggled against me.
I stood frozen watching the innocent young girl turn into one of the sexiest, most fuckable women I've ever seen.
She stood up and looked over her shoulder. She offered me her loofah.
With trembling hands I took the soapy loofah and began to drag it across her shoulders. Then down her sides. As I moved further across her ass. Zoe spread her legs. I bent down and dropped the loofah. As my wet fingers began to massage her ass cheeks. Each circle closer to her asshole. I spread my fingers and slid my large, thick fingers under till I felt her wet pussy hair against my fingers.
She flinched as my finger pressed her hard clitoris. She leaned forward and spread her legs further.
I slowly pressed my finger into her pussy. As her sweet folds welcomed my finger she let a moan escape from her mouth.
I slowly pressed my finger deeper with each thrust. After a minute she stepped forward and my finger escaped her hot wet tight pussy.
And turned and jumped into my arms. He legs wrapped around my waist as I cupped my hands under her ass cheeks.
She kissed my neck and licked my ear. Her hard nipples pressed into my chest. I moved my fingers into her asscrack. She moved her mouth to my ear. "You went break me, but I need to go see cara before she misses me".
She sucked my neck and pressed her ass further on my fingers. I slipped one finger into her pussy knuckle deep. She moaned as she marked my neck. I wiggled my finger as she began to bounce up and down on my finger. She released my skin. She looked at me eye level, she winked and told me "I'll come see you tonight".
Then she pushed herself from my grip.
I stood naked stroking my cock as she walked out of my shower.
I stroked a few times and shot my load against the shower wall.
Once I calmed down enough to dress myself I brushed my teeth and walked out of the bathroom.
I knocked on Cara's bedroom door. I opened it to see both girls sitting on her bed. Each had their phone and was giggling a they shared pictures or gifs.
"Young lady you have school in the morning and you the thug of the family have a day of work with the slave driver" I teased.
Cara came and hugged me and kissed my cheek. Then Zoe jumped into my arms and giggled. I quickly put her down as I feared Cara suspecting anything.
I closed the door and walked to my room. I closed my bedroom door and landed against it. Puzzled at the events of this evening.
I got in bed, clicked off my lamp and waited.