You creep up on your sister, slowly, but carefully. Once your right behind her you grab her and immediately stick her head in your mouth. She gives off a quick yelp of surprise and jumped a little which actually helps you swallow her. You raise her up into the air and continue to swallow her, hoping that gravity will help you. Once you do this you feel a liquid running down her.
It's her vaginal fluids, she's getting off on this. You keep swallowing, savoring her flavor. You lick all of her fine curves as she sank deeper and deeper into your stomach. Once you get her feet in your belly, you let out a small burp and lie on her bed.
You can hear her masturbating in your stomach before you can her say. "I know you're the birthday boy but it's a bit rude to sneak up on someone like this."
You smile and say. "Don't deny it, you enjoyed it."
You can hear her moan while she masturbates in your stomach while she says. "You're right. What are your plans for me?"
