Tentacles and cum inside of you

You are on the ground pinned down by tentacles. A tentacles goes up your ass, and a bunch of cum eggs go into your body through the tentacle in your ass. Your body starts to inflate a bit from the cum, then the tentacles start to go up your ass and inside your body. After a few hours, the monster is now inside you, and you feel so full right now. Your sister comes back, WOW you took that like a champ she smiling slyly. What is this fucking doing to my body, he asked angrily. Well... she said.

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