Instead of possessing your little sister, you decide to go off for a more suitable and fun target; your older sister Mary.
As Joanna is waiting for your response to enter her body, you start to slither away from her towards the stairs.
"David? Where are you going?"
As you reached the top of the stairs, you started to slither over to the door of Marys' room. Joanna looked confused.
"David, why are you going in Marys' room?" You slid under the door sneakily and saw that Mary was in front of her mirror putting on makeup for a date.
Almost immediately after getting into her room however, Joanna knocks on the door.
"Joanna? What do you need? I'm kind of busy" Mary said as she opens the door for Joanna.
As Mary opens the door, Joanna spots your slime state sneaking up behind her sister, and starts to panic a little bit.
"S-so lets just say, hypothetically, that I k-know where David is.... You must promise to keep it between us."
"You mean you knew where he was this entire time? How come you didn't tell someone sooner? "
As the two continued quarreling, you decided that now would be your chance. As Mary started to scold Joanna, you snuck up right under Mary. Joanna was fixated on you, and she was shaking her head as if in disapproval. Mary noticed that Joanna wasn't paying attention, but as soon as she turned her head you shot up into her panties and starting flushing your slime state into her vagina. Mary started to struggle and moan, progressively louder and louder. Joanna watched fascinated, witnessing how insane your powers were. As most of your slime has already entered your sisters' pussy, she is already on her knees, begging Joanna to help her, but it was too late.
As your final bits of slime entered, Mary let out one final moan and fell limp. She fainted, her head fell forwards but she remained on her knees, hair in front of her face. As you gained control, you couldn't help but let out a silent and menacing chuckle.
You have taken your older sisters body. A quite attractive body at that, large breasts, round ass, slim body.
But you had to remain steadfast on your objective. You got into Marys' body to tell Joanna how it all happened.
So after about half an hour of storytelling, Joanna finally understands your truth. Now it was Marys' turn to know the truth, so you told Joamna that you were exiting Mary and then entering her, and she agreed.
With that you exited Mary through between her breasts and landed in front of her. She let out a relieved gasp and went limp for a moment. You decided that you had to get into Joanna as quickly as possible, so you hopped in between her tits and started to enter. She gave little resistance and then she became yours.
Mary began to stir, and she became confused.
"Ungh.... J-Joanna? What happened? How did I get downstairs?"
"Mary... It's not your sister you're talking to right now. It's me. David. Just let me explain."
Mary began to panic, and you began to calm her down being Joanna. You couldn't blame her, it was a crazy thought, possessing your sisters.
"H-How do I know you're not messing with me Joanna? How do I know it's really you, David?"
You didn't exactly know what to tell her, so you decided to just show her. You exited Joanna from her vagina and she let out a gasp. She came back to consciousness much sooner than before, meaning Joanna is now becoming used to you.
Mary stared, bewildered at you slime state.
"It's true Mary. David became this slime after an accident at the military base, and now he can possess people by entering their bodies."
"That felt... Weird. Like I felt my body being used, but had no control over it. David, if that really is you, we can't tell anyone else about this yet. So you're going to have to hide in one of us.
You decided to choose...
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