Encouraged by the family pet, I cum deeply inside my own sister!
My sister Jenny (10y) and I (14y) had been playing in the garden while our parents were away on a weekend trip together. I was old enough that they trusted me to watch her.
As we were playing tag we both noticed out dog Brownie humping the neighbors little white dog. As his cock pierced the little white dog, my sister gasped in softly, as if in awe. I was transfixed myself and felt my little cock start to get hard. We were both in puberty, Jenny having gotten her first monthly two weeks ago, and I was incredibly turned on by anything.
Jenny noticed my arousal and slowly came closer to me. I thought she just wanted a better view of the dogs fucking like rabbits, but she carefully stuck her tiny hand down my pants and palmed my cock through my boxers.
“Jenny! What the fuck?!” I gasped, secretly enjoying every second of it.
“I know you moan my name when you play with yourself at night, big brother… Come inside and make me feel good too.”
Shit. I hadn’t known she’d heard me, but fuck it. I couldn’t resist such an opportunity. We ran in the house and I threw her into the couch, pulling off her cloths and kissing her vagina softly, circling her clit with my tongue before licking big striped across her vagina and tonguing at her opening.
“Fucking get inside me already, brother, oh my god!” Jenny screamed, her pussy puffed and throbbing to be filled. That’s all it took for me. I pulled my cock out and lined myself up with her opening, slowly pressing in and trying to hide my shock when I slid in with no resistance.
“I like to play with Mommy’s toys and popped my own cherry with them.” Jenny moaned out, clenching around my penis.
“Fuck Jenny, I’m not going to last long if you tell me things like that.” I whimper out, thrusting into her quickly, much like our dog had, my body ready to breed my sister. My own sister.
“Fuck Jenny I’m cumming inside!” I screamed, pressing our privates together and feeling her walls flutter around me as she cums alongside me, having been rubbing her own clit alongside my strokes.
My semen spurted deeply within her vagina, her orgasm’s contractions dipping her cervix into my potent swimmers. It was only in the afterglow I realized she must be on her most fertile days, having seen the last pad in the trash two weeks ago. “Fuck, Jenny, I’m so sorry. I couldn’t pull out!”
“I want a baby, brother. I touch myself thinking of you too, you know. I pray every night for you to spill your seed in me and make my belly round with a baby. Why do you think I grabbed you outside?” Jenny moans out, moving on her back with her legs in the air to keep my cum inside.
After hearing that admission, I kept Jenny’s pussy filled with my semen the rest of the weekend, intent on fucking a baby into her. Sure enough, two weeks later Jenny’s breasts began to feel tender, and I noticed her running to the bathroom during breakfast a few morning to get sick. After a trip to the doctor with our mother, it was confirmed: I was a father. Father of my little baby sister’s baby. It was my semen that forced her womb into submission.
That night I came harder inside of her than I ever had thinking of how I would spend the rest of my life keeping her belly swollen with babies. I couldn’t wait until we forced our babies go make babies with their siblings too!
