Hot Summer Job/Pick her up and move her somewhere else
As the last of your ball juice squeezes out with the last few twitches of your penis, you feel compelled to be a good lover and give your sister the fun and excitement she seems to be craving. But not here though, you need to find a more suitable spot. You lift up Bree from the back of the couch, receiving delighted giggles from her as she begins vigorously bouncing in your grip to a point where you are really not able to walk. You take a few stumbling steps back over toward the entry way before having to stop as her bouncing makes it impossible to climb the stairs. You find though you have a far more rapidly developing second problem. Having just cum for the second time in your sister in such a short time, and having had it just sitting in her sheath the entire time to the point of becoming aclimated to it, your penis is rapidly loosing its rigidity.
“Uhh... Bree..” you try to caution her, but by now it is already too late. On one of her up-swings, your limp dick falls from her snatch. This does not go unnoticed by the fourth grader as she stops instantly to look down. Her reaction though is a little more extreme from what you might have expected. She takes a giant gasp, and at the exact same moment you feel a warm blob of your cum landing right on your limp shaft. She immediately struggles out of your grip, and then darts upstairs with both her hands in her crotch. Before you are even sure what happened, you hear the bathroom door slamming shut.
What was that? Your dick slipped out of her and then she went running. Maybe she thought your cum dripping out of her was pee or something?