Brother,Sister and cousin threesome

It was a stormy night when the following event took place and the day it did happen was on Halloween. My name is Chris and I had just turned 18 the previous month. I have a sister called Hannah and she is 16 and we also have a cousin called Isabella and she is also 16. Both girls spend lots of time with each other when they are together but I never would of ever thought why they did until only a few hours before this major event occurred. The three of us were at mine and Hannah's house and both of them were in her room and I was downstairs watching TV. My mum and dad had gone to a Halloween party and would not be back home until rather late in the night so it would just be the three of us at home during the night. It was getting close to the evening and I had wanted to make sure that we had all had something to eat for our tea before anybody started to come knocking on the door wanting some sweets. I went to my sister's bedroom to see if there was anything in particular that they wanted to have but as soon as I got to her door I heard some noises that just did not seem to be normal at all so I decided to investigate what those noises were.

Let me know guys if you want me to carry on with what happened at the next part of the story and if you do then I will continue with the rest of it xxx