A few days later

The story continues a few days later. I continue going to work like before, having gotten over Amy's nasty comment from earlier in the week. Mom and Dad said that they were going on vacation for a week so as soon as Amy found out she decided to throw a party.

Now I didn't have anything against the idea. It was the beginning of summer, perfect weather, we had a nice house with a pool and I started to really enjoy drinking from college. I invited some of my friends from home but most of the people invited to the party were guys and girls that Amy went to high school with who were seniors.

I called up one of my friends to buy the **** for the party which she gladly did. Everything seemed fine, Amy and I bought food and different snacks and set up our house for the party. As we got home it was 3pm and by the time we set everything up, it was 4. I ran upstairs to change into my bikini that had a white top and black bottom. I also tossed on a pair of ripped jean bootyshorts and a tshirt.

Very shortly, I hear cars pulling up and people ringing on the doorbell, I opened the door up for them and pointed them in the direction of the backyard and pool. I put a sign on the front door saying "WALK AROUND THE BACK" to prevent people from continuing to ring the doorbell. Before long, there was music playing in the background and the party was started.

My friends arrived shortly and I let them into the house as they stripped down into their bikinis and walked outside getting into the pool. I stripped down to my bikini as well and followed them outside also climbing into the pool which was getting pretty packed.

There was a game of beer pong outside the pool, as well as stack cup and inside the pool there was an inflatable game of beer pong. I decided to play with my friend Taylor for the first game. We took out shots, both missing as the other teams got the ping pong balls and got ready to shoot. Then I saw Roy walk into the backyard with his arm around Amy and gave her a kiss.

Amy was wearing a bikini and I could see even from where I was, that Roy was definitely checking her out. It was her most revealing bikini too, she probably did it just for him, I thought to myself. The beer pong game continued and Taylor and I managed to win, taking two victory shots of vodka before playing another one. More people climbed into the pool and it started to get really crowded.

Then out of no-where I felt a hand on my lower back pushing down and then slip into my bikini bottom quickly groping my ass before I turned around and quickly the hand shot away. I couldn't see who it belonged to but I did get pretty weirded out by just getting groped.

The party continued and I took another few shots and downed some beers. Before long it was midnight and everyone started heading home. As my friend Taylor left, who was the last person at the party, I looked over the mess of a backyard and decided that was a problem for tomorrow.

As I stumbled into the house, being pretty drunk I started making my way up the stairs. As I got up to the second floor, I started walking towards my room at the end of the hall but stopped next to my Amy's door which was nearly shut but there was a slit left open. There were sounds coming from the room, usually I would have walked away but the **** in my system lead me to peek in there and I couldn't believe my eyes.

Amy was laying on her bed with her legs over Roy's shoulders as he was on her knees fucking her and she was moaning to his thrusts.

I wanted to leave but couldn't **** myself to walk away as I watched my sister get fucked by this black hunk of a guy. I could clearly see his muscles were quite defined and from the moans that Amy was making, I could guess that he knew that he was doing. I continued watching them for another 20 minutes till Roy pulled out and came over Amy's face, tits and stomach. By that point I managed to finally get myself moving as I made it to my room and collapsed onto my bed wearing only my bikini and passed out with my door open