She grins. "A nice, big, fat, cock, maybe?" she offers. "Or maybe just make your clit swell, when you're aroused, let you use that... oh, the possibilities. But, a tail, that's easy; like mine, you say? Not like a cat's or anything?" She waits for Ruby's response, then orders her onto her belly, retrieving another of the flesh-adding grubs, applying it to her backside, drawing out the tail, slowly and steadily, to ensure she has both control over it, and feeling in it; Ruby can feel her making some adjustments to her spine and nerves, and soon, she becomes aware of the tail, like a third arm, and, while it's not as dexterous, she can certainly manipulate it, easily; if she keeps it like the succubus', she'll be able to use it to grasp simple objects, as it's entirely muscle, and surprisingly strong.