Let's make this the threesome that it was meant to be.
From Create Your Own Story
You position yourself behind Kara, your cock throbbing with anticipation as you line it up. You can feel the excitement in the room build as Matt watches you, Kara steadily slurping away at him. You rub your cockhead on her opening and she murmurs a bit and again pauses, but Matt again continues to guide her head in his lap. You keep rubbing your cock up and down and you can feel how slick and wet she is. She doesn't reach back or make any other move to stop you, so you wrap your hands around her tiny waist and pull her onto you as you push forward. She is so tight that you feel like you are going to black out... but it is an amazing feeling.
You jam your cock in and out of her, loving the feeling of her tightness wrapped around you. She occassionally murmurs but her throat is mostly muffled by Matt's cock, which is buried to the hilt in it. It is quite the sight to behold and your senses tell you that you are going to blow your load pretty quick at this rate.
