You start to fap your cock but you already know it wouldn't work. "I want someone here" you quickly mutter under your breath. Soon after there is a knock on your door and a voice comes through. "Hey are you done in there? I think I left something inside the bathroom" it was your sister's voice, you knew it was taboo for incest to happen but you couldn't resist. "The door opens" you say and the door quickly opens and cum starts to flood out "WHAT THE HELL" Your sister screams out as she sees your 75 inch cock. Quickly you grab her and close the door. "Sorry sis but I can't stop myself" before she can respond you start to put your member inside her. She started to groan in pain as you cock penetrated her and almost immediately went to her cervix. You could feel her warmth wrap around the first few inches of your cock but you wanted more so you trusted in harder and you prod into her womb. Your sister groaned and screamed at the top of her lungs as you push in further getting roughly 21 inches in. "I want to go in all the way to the end of my cock" suddenly you slowly stretch out more and more of your sister, as each inch entered your sister she moaned heavily she started to feel good as she got stretched out. Halfway down the shaft you felt a sudden tightness as your sister spasmed. She was cumming hard to your cock and so you couldn't wait anymore and thrusted completely in, she screamed much louder then before but now in pleasure instead of pain. "YES!!! MORE!! MOREMOREMOREMORE!!!! FUCK MEEE!!! DESTROY MY PUSSY!!! MAKE IT YOURS!! STRETCH ME SO IT’LL NEVER GO BACK TO NORMAL!!! MAKE IT MEMORIZE THE SIZE OF YOUR FAT DICK!!!! AHHHAAAAAA!!!!!! YESSS…. I’M A WHORE!!! A DIRTY WHOOOORE!!! FUCK MY WHORE PUSSY HARDER!!!! PLEASE PLEASE POUND ME!!! STRETCH ME!!! FUCK MEEEEEE!!!!." You hear things that you would never thing your sister would shout out and it only makes you more lustful. You bucked into her even harder as you feel her cumming again. You also feel your own limit reaching soon "AHHHHHAAAAAAAHHHHH…. YES!!! RIGHT THERE!! POUND MY PUSSY MORE!!!! AHHHAAAAA!!! SUCH A FAT COCK!!! I LOVE COCKS!!! COCKS! COCKS!!! COOOOOOCKS!!!" your sister has orgasm after orgasm on your cock with her juices covering the bathroom floor. "“AAHHHHHHH!!! I’M CUMMING!! I’M CUMMING SO MUCH IT FEELS AMAZING!!!!!! MY INSIDE FEEL LIKE IT’S GOING TO MELT!!! SUCH A…. FUCK!!… BIG DIIIIIICK!!!!! AAAAHHHHHHAAAAAAAAAA!!! I’M GOING CRAZY!!!! FUCK ME HARDERRRR!!! MAKE ME INSANE!!!!!!” Hearing this pushed you over the edge and after some rough thrusting you cum in the womb of your sister “AHHHHH!! YOU CAME!! I CAN FEEL YOUR CUM INSIDE MEEEEE!" you pour all of your semen into her slowly inflating her like a balloon. Your sister hangs her tongue out of her mouth like a dog as she moans with each rope going straight into her womb. After an hour the flow stopped and you pulled out. You see your sister on the ground with luscious curves and it starts to make you aroused again..