Granted, while most of the characters from Mobius are about the size of a small child if Sonic X is anything to go by, there's always room for messing with scaling when it comes to porn, I'd say. On the one hand, there's the typical depiction of her in porn; the teaser, the manipulator, having her partner writhe in pleasure as she gets exactly what she wants. Works like
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or
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come to mind. On the other, Urban Demons is typically about having hot chicks do what the protagonist wants, either through adorable seduction or coercion. So imagining Rouge simply taking it on the floor when you don't even get to see her face just seems... off to me, if that makes any sense...
Also, I'd be fine with her having a tail, but if she doesn't, oh well.