Both of you

You are both astonished for a few seconds. Something suggests you that it is better to close the door for what is coming. The apparent Tina sits more comfortably, but she keeps moving her finger as if she wants to resume what you have interrupted, howering between arousal and confusion.

-You're not Kim?-.

-No, I thought you were!-.

-Do I look like Kim to you?- She asks grinning. You cross your arms under your new bosom: -Then who are you? Because I know for sure I'm Tom, but you're neither Kim nor Tina.-.

-No way.- She almost whispers: -I'm Tom! So you're... me? You stayed inside Kim? I thought she was waking up so I ran away but...-.

-Hold on.- You say. This is much to assimilate: not only you are a goo that can possess people, but you can also split. While you're thinking, however, your possessed sister resume her play and massages her tits.

-Hey, come on, this is important!-.

-Yeah but that's, ah~, hot too! I'm both Tina and Kim, just thinking about it is... oh god...-.

You would like to scold him, but inside you something clicks. You picture various devious scenarios, of Kim and Tina pressed on each other upon their beds while everyone sleeps, of them hanging out as sisters but then kissing passionatly behind a corner like two nymphos, not being anymore the reserved girl and her loving mature sister but two perved sluts, and nobody would ever suspect a thing...

-Mmm... ah...- You hear, and it takes you a moment to acknowledge they're your moans: you have discarved your top and now you are pitching your prominent nipples, and your pants are fully moist. You are so, so sick, but it can't be helped.

-Woah! Check this out, "me"! Watch these!- "Tina" exclaims, pointing at her boobs... which have become an M, maybe N size.

-How-How did you do it?-.

-I just wished they were bigger and... wait...- She seems to concentrate and her tits deflate like baloons to their normal dimension.

-No way! I can modify her body! I am a shapeshifter too!-.

You feel your leg trembling, you're almost scared by the amount of powers you achieved in one evening. You need a moment to rationalize it... or you could just join Tina.