My Cousin Jessica

It started off as just a game, but turn into something more serious.

It was mid-July when my cousin Jessica came to stay with me. I was 21, free as a bird living on my own. I just got a new job not too long ago and was making good money. So I invested in a small house in the country, far from the peering eyes on neighbors.
“Hi Chris!!!” my cousin said to me busting through my front door. I got up to grab her bag, but instead, she dropped her bag and gave me a big hug. And all of a sudden, I started to get turned on. I had to let go of her so she couldn’t tell I was getting hard.
Now my cousin is like most normal girls nowadays. She is 15, about 5’6″, 115lbs, blonde hair, brown eyes, 36c breasts and a cute tiny ass. She was wearing a tight white tanktop, and a pink pair of shorts, which shaped her tiny ass perfectly. If I hadn’t had sex before, I would have cummed in my pants just looking at her. She finally bent down to pick her bag up, which made my eyes dart to her ass. After a few seconds, I woke up from what seemed like heaven to me, to find Jessica looking at me.
“Hellooooo, earth to Chris, you can come home now” waiving her hand in front of me. “Sorry, you just grown up since the last time I saw you” I said smiling at her, which made her blush. After getting her settled in to her room and her spending what seemed like forever in her room getting changed, Jessica came out wearing a pair of shorts, and her bikini top. My mouth hit the floor. Her blonde hair just touching the top of those perky round tits made me get hard again.
The house I bought had an in-ground pool which Jessica fully planned on taking advantage of. I went to my room to change and get into my bathing suit when the phone rang. It was my aunt calling to make sure Jessica got there ok. Her friend dropped her off earlier and was just calling to make sure she was fine and asked me again if it was ok. As I was getting dressed, my shorts at my knees, a knock came at my door as my cousin burst in. “Hey Chris, I saw th—.”
There standing in my doorway holding her towel was Jessica staring straight at my semi-hard cock. I froze, standing there now my shorts at my ankles, in full view of my 15 year old cousin. After what seemed like forever, she turned, left my room, and shut the door. After pulling my bathing suit on, and thinking to myself about how I was going to handle this, I left my room wondering if she took her stuff with her when she ran out of my house heading for who knows where.
But instead, my cousin was outside in the pool swimming laps. I figured maybe a beer of two might help calm me down. After pounding 3 beers down, I headed out the door. I walked to the pool edge and sat down, letting my feet just dangle in the water. Jessica didn’t come over to me at first, but eventually came over to talk to me.
“Hey Jess, can we talk about something? I said hoping she didn’t scream at me. But instead she just smiled and said “Ok Chris” “What happened in my room, well…