Life of a 13 year old- That you mixed up her pills when she wasn't looking
"No problem Rachel...you'll dripping sperm for at least a week...and pregnant with my baby.", you add wryly.
"Wait what!??", her eyes jolt wide open. "You heard me sis, I mixed up the pills that mom bought you today. You took the wrong ones!"
She tries to get you off of her, but you have the upper hand and keep her down. Although Rachel is struggling to get free of you, she still moans between grunts of effort. Before long, she orgasms again. Just like last time, you fuck her until she is unconscious.
You push as deep as you can, cramming your length inside her until the head of your prick breaks into her uterus. At last, you can't resist and shoot jets of semen like a hose, plastering the thin walls inside her pussy. Rachel comes too just in time and cringes as your nasty baby batter shots splatter inside her twat. She whimpers each time she feels the goo hit the bottom of her womb. After pouring almost half a pint of cum into your older sister's body, you collapse in exhaustion with her.
You: