You just moan

You try to say something but all that comes out is a moan. You feel both your sister and John pull out in unison, and you squirm restlessly, suddenly empty. Soon, you see John back in front of you with a wicked smile, and you feel Sis behind you probing your pussy. Without warning you are pulled in two different directions as John grabs your head and slams you down on his cock and Sis pulls you back impaling you on her dick. With that last thrust both of them let go and you are filled completely. It feels like an eternity as they pump cum into both ends of you. In the background of your high you feel them pull out as you drop down moaning as cum runs out of you.

As you start to finger yourself you look up at your big sis and think this is the start of a long amazing adventure.

Authors note: Just wanted to wrap this up, not taking it further but feel free to do so on your own