"I don't think that would be a good idea" you said "we're sister's and we're still too young for anything like that." you rolled over facing away from your sister
"oh come on I know you have been feeling it lately too." she said, sounding frustrated and sitting up in bed.
"feeling what?" you said setting up and looking her dead in the eyes.
"you know what. you seriously think you wet the bed the other night." she said mockingly.
Your eyes went wide "b-but we're only 8"
"only physically." your sister said. "you have the same memories as me. this must just be another side effect of us coming from the same person."
the room went silent for a while as you just sat there thinking. After a few minutes of this your sister grabbed your hands and pinned you to the bed. you laid there shocked as she kissed you. you started to feel a weirdness in your crotch like the other night but a lot more intense.
"b-but we're still sisters." you said as your sister pulled away from the kiss but you didn't try to stop her.
"Just think of how amazing sex will feel when we both feel the same thing though." she said.
Your eyes went wide. you could see her little cock sticking out of her waistband clearly erect and noticed that yours too felt uncomfortably confined as you were still wearing pajama pants. you also felt a wetness starting in your young pussy. Sam reached down and started taking your clothes off. You whimpered in protest but otherwise didn't try to stop her. Once she had you nude you felt her line her cock up with your tiny hole before thrusting in roughly. you gasped as you felt yourself penetrating and being penetrated at the same time. Your sister did the same and fell on top of you as you wrap your arms and legs around her. she thrust into you slowly the pleasure being many times multiplied as both twins felt the other's pleasure. it wasn't long before any uncertainties you had faded away and you grabbed your own needy cock and started to jerk it as your sister continued to plow you. This made her give a whimper of pleasure as she continued to fuck you. It wasn't long before you both built to a massive orgasm sobbing and screaming in pleasure as your pussies and dicks blasted their respective fluids all at once.