Further breeding

You spend the entire afternoon in your bed with your little sister Sofia, shooting load after load into her tight, smoothly shaven 18 year old pussy. With the house to yourselves, you try as many positions at possible. Sofia riding you hard until you grab her hips and hold her all the way down on your cock until you flood her womb with your thick sperm. Spooning her from behind, making her thrust back against you. Doggie style. Bending her over the bed, fucking her so hard her feet leave the floor from your powerful thrusting into her slender body. Finally you finish her off with an anime style mating press, practically folding her in half with her legs pushed back almost to her head as you cream her pussy for the final time that afternoon, sending your sperm on a mission to impregnate her. You know it will probably take a week or so before the birth control wears off and she's fertile, but you and Sofia are having fun trying to get her knocked up regardless.

When the two of you sit down family dinner with your parents hours later, the two of you look exhausted and disheveled. Your father ignores it while your mother side eyes the two of you. Sofia is wearing an oversized t shirt and panties, and she squirms in her seat, probably because of so much cum leaking out of her while she tries to act normal.

You're grateful for the breather after dinner as your balls recharge. It had been quite the day, taking Sofia to the sex shop between breeding sessions. You catch up on some homework and reading, until 10 PM when again your sister slips into your room, still wearing the same t shirt and panties.

"Bed time already?" you ask her, remembering what you told her. She'd be sleeping in your room from now on. Your own personal fuck toy to breed at your leisure.

"Mhmm" she says, walking towards you. While doing so, she slowly lifts her shirt, revealing her panties. Yet again they're absolutely drenched in your spunk, the white cotton translucent and glistening as it clings to her womanhood. "Look what you did to me big brother."

Your cock hardens instantly at the sexy sight as you admire your handiwork. You notice she's wearing her "Breeding Bitch" collar again, which only makes you smirk.

Getting up from your chair, you walk towards her and take her into your arms, kissing her and then leading her to the bed. You touch the collar gently.

"Naughty naughty little sister. Did you wear this collar hoping big brother would push you down on the bed and try and make you pregnant again?"

"Yeah" she says softly, her breathing getting more intense as your hands explore her body. "That's what I want."

"Wasn't this afternoon enough? I felt like I came in you so much I could've knocked up half the girls in school."

"We have to make sure" she says softly, her face flushed.

You've noticed that since the other day your little sister has become more obedient and submissive. Was it the contract you signed, or was this Sofia's true desires? You're not sure yet, but you're certainly not complaining. it only makes it more arousing that she wants it to.

Sofia flings off her t shirt and takes off her panties, which fall onto the hard wood floor with a wet splat, much to your amusement. She bends over the bed and sticks out her ass, her smooth pussy lips already covered in semen from your earlier fucks. You drop your shorts and walk up behind her, teasing her pussy by rubbing your hard cock up and down her slimy slit.

"What do you want me to do Sofia? Tell me" you say, continuing to tease her pussy.

"I want you to put your cock in me again" she says huskily, pushing her ass back against you and trying to impale herself on your cock.

"And?" You know what she wants, but you want to hear her say it.

"I want you to cum deep inside me and make me pregnant" she moans, panting with need.

"Good girl" you say, pushing forward and impaling her slowly, making her savor every inch of your manhood as it sinks into her sperm drenched needy cunt.

You pick up the pace, fucking her faster and faster, the sperm churning in your nuts. The sounds of flesh smacking together as you hips meet her ass fill the room. Her sexy moans and pants as you take her eventually become too much, and you ram yourself to max depth in Sofia as you prepare to cum.

"Here it comes Sof. Take it all and get pregnant" you growl out. You feel her tighten up in excitement just as the first burst of cum leaves your cock to jet powerfully into your sister's willing womb.

You feel her spasm around you, moaning as she obediently takes every drop of your seed. Finally the two of you collapse, falling onto the bed, desperately trying to catch your breath.

"Damn that was good" you mutter. You look at your sister who has a stupid grin on her face, looking quite pleased. She nods her head in agreement.

"Can we do it again?" she asks, much to your disbelief.

"You really are the best little sister" you say, dragging her into your bed where you continue to fuck until the two of you fall asleep with Sofia cuddled in your arms.