Hot Summer Job/Insist that she really needs to pull off or you might get her pregnant
Your brain goes fuzzy for a little while. You know you can't cum in your sister. You have no idea why you were so stupid as to stick it in like this in the first place, but now you definitely can't keep it there as you are already on the brink of ejaculating your incestuous sperm into her fourth grade womb. You know that girls are normally supposed to have their period when they are 11 or 12, but it would not be in any way absurd to think that Bree might already be fertile at her age. Mom and dad would freaking kill you if you got Bree pregnant, although you can't deny the thought might turn you on just a little, having your kid sister carrying your baby.
Oh God, you should not have thought that just now. You start to feel your balls churning in response to the mental image of your sperm entering her little unprotected and possibly fertile womb. “Bree, you have to get off.” You tell her in an urgent tone as panic and adrenaline course through your veins.
“Nooooo...” Bree complains, holding onto you even tighter with her arms and legs, clinging to you with a freaking death-grip.
“Bree!” You say her name as your racing thoughts spur you into action from every conceivable angle. You begin grabbing and pulling on her hips, trying to physically pull her groin off of your penis, but your angle is bad and you have only the strength of your arms while her angle is very favorable to her and she has the strength of her entire body pulling her deeper onto your dick.
“Bree, I'm about to cum!” You say, still gently pulling on her as you look for an opportunity or weakening in her resolve so you can act.
“Dooon't, It huuurts!”
“Bree! Come on!”
“I don't want you to put me down! Don't put me down Riley!”
“Bree, I'm going to cum and your going to get knocked....
“NOOOO!”
This is bad. This is REALLY bad. You can start to feel your balls boiling. Your groin is beginning to tighten. You try hard to bite yourself back from cumming, using every bit of your willpower to stop your orgasm as you are right at the edge. “You might have a baby Bree...” You argue with her in a final desperate attempt to convince her. You know at this point the very second you relax your focus you will be painting her insides full of your little swimmers.
“It HUUURRRTS. My privates hurt.”
“It's going to hurt a lot more when you are in labor, now please get off!”
“NOOOO!!!!”
You are hyper ventilating like crazy at this point, and you feel yourself starting to black out from all the exertion. Damn it! As you loose your concentration to hold back your orgasm, all the muscles in your body seem to relax for a moment while your orgasm begins like you are letting out a good piss after holding it in for so long. The entire rest of the world seems to go into a dull haze and a chill feeling makes its way up your spine and into the base of your skull as the punch of your pulsing genitals begins to resound throughout your body like a drum-beat and the first shots of your semen begin to rip from your dick and directly into your little sister's womb. You let out a frustrated groan as instinct and resignation kick in and you go from trying to pull her off you to pressing her further down on to your inseminating tool.
“I don't want you to put me down Rilieee” Bree continues on unabated as you fill her child sex full of incestuous semen. She seems to even be crying a little, but you really can't bring yourself to care at the moment. You feel like you are in a completely different world right now and all your cares just seem to wash away. You pulse inside her over an over again. It is easily the most intense orgasm of your life, and every drop of it is going inside your 10 year old sister, and it does not seem to ever be ending. It is as though all the sexual frustration you have had since seeing Kylie naked are coming out right now and your balls are taking it out on Bree's womb. You have no idea how much sperm you are dumping inside of her under-age pussy, but it does not seem to ever be ending.
“Rilie!” Bree says in a sudden start as you stagger backwards and only just barely catch yourself on the hand rail of the nearby stairs. The constant thumping and swishing in your ears that coincided with the pulses of your orgasm comes to a momentary stop as you slide yourself down the banister and gently lower yourself to the ground. As soon as you are safely sitting on the ground though, another two pulses fire off rapid fire, followed by a third and a fourth before it finally feels like it is tapering off.
“Rilie! RILIE!” Your little sister calls out in distress as she tries to shake you by the shoulders.
“I'm Ok,” You manage to groan out as a final tapering fifth pulse from your dick actually manages to squeeze out a little bit more. Meanwhile, Bree stands herself straight up and a cascade of pink-tinted thick white goop drops from between her legs and plops audibly onto the hard wood floor between your legs with enough force that you feel it splatter against your balls.
“Oh!” Bree squeaks as both her hands immediately fly to cup her leaking genitals. She gives you a pained and uncertain look as though to say she is sorry for the fact that she is about to leave, and then she makes a mad dash up the stairs while you just let out a sigh and begin to black out a little while your dick is still twitching out dry heaves. The last thing you feel as your head hits the floor is a last dribble of sperm oozing out onto your stomach from your twitching and wilting member.
You are sure you are not out for long, it is just a little bit of light-headedness that clears quickly after your head hits the floor, but all the same you feel like your entire world is spinning as you stare up at the ceiling. You can muster just enough strength to pick up your head and look down at your body. You are still naked, and you can still feel a little bit of heat from your cooling semen that has leaked all over your groin along with Bree's virgin blood.