I've had sex with some weird, embarassing things and people in my dreams. And whenever I attempt sex with someone normal, the person or dream suddenly changes to something non-sexual and completely off-turning. I'm pretty sure there's some kind of theme of self-hatred or insecurity in there.
As for your dream, I don't think it means anything significant, unless it's something innocent like an unconscious wish to spend more time with your sister than you're doing right now or restoring an old, closer bond you had with her.
Still, if push should come to shove, be sure the camera crew you hire knows what they're doing.
da blob 
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