You send her away

As much as you'd like to involve your sister in the many lewd sex acts you plan to engage in with Rouge, you can't shake the feeling that now simply isn't the time.

"Hey Lil, could you leave us alone for a bit?"

"...Okay." she replies, rising to her feet with palpable ****. She shoots Rouge a look that rides the line between anxious and reassuring before turning to depart, closing the door quietly behind her as she goes.

Rouge watches her go with obvious dismay, but you move quickly to soothe her, lifting a hand to rub at the small of her back.

"What's up? You okay?"

"Yeah. This is all just really new. And really weird. Like, I miss her already... But she's me... You know?" she sighs, casting a furtive glance your way, "That, and... I just noticed how flat my butt really is."

"Heh! Well, you've got a new one now... And it's anything but flat." you reply, giving her left flank an experimental squeeze - she freezes up, though, leading you to believe that she may need a little more time to adjust.

You stand up and move over to your bed, taking a seat and making yourself comfortable before gesturing for her to follow:

"Want to talk for a bit?"

"Sure." she replies, eyes softening at the prospect of chatting with you instead of immediately submitting to your carnal desires. She climbs up on to your bed with some difficulty due to her small stature, but you're satisfied to see her assume a casual, cross-legged sitting position after arriving at your side.

"So, what's it like?" you begin, looking down at her with an easy smile on your face, "Being someone new, I mean. It must be a little confusing."

"Ugh. Definitely! Yes." she exclaims, toying with her oddly-proportioned feet while she attempts to formulate an answer, "...I feel like I'm just going to sound crazy if I try to explain it."

"Well, try."

Rouge pauses to take a deep breath, her brow knitting in concentration.

"I guess I didn't know what it would be like. I thought I did - I thought this thing would be, like... Just a robot that acted like me. That, after it came, I would stay me and I wouldn't have to think about the weird stuff you did with it... Does that make sense?"

"...Sort of." you prompt, your tone of voice signalling that you haven't quite got a handle on what she's saying yet.

"I guess the best way to say it is it feels like I... I dunno. Transferred? One minute we were looking down at the bat-girl, the next minute I WAS her. I'm, like, IN IT in it... And I didn't expect that at all. I still feel like me, except I'm really short... And I'm breathing - because it's what I'm used to, I guess - but it feels like I don't really need to."

She pauses then, (apparently not due to lack of breath) and buries her face in her hands before uttering her final statement on the subject:

"...And now it feels like I'm just expected to have sex with my own brother, and I don't know what to do!"

You're not the most sentimental guy in the world, but Rouge's words definitely strike a chord with you. You don't hesitate to pull her into a bear hug of epic proportions, (which she leans into with gratitude) before mustering a tender reply.

"Hey... Hey..." you whisper, stroking her headfur affectionately, "You may still feel like Lily, but you're a new person now. When you think about it, this is a chance to be different... To try new things. Right?"

The way she continues to shake in your arms seems to indicate that your Love Doll isn't ready to accept this line of logic yet, so you try a different tactic:

"If it seems too hard, I can use voice commands to make it easier," you suggest, trying to keep your tone soft and even; "I can make it feel better for you... Or increase your sexual acceptance... I read about it in the manual. Do you think any of that would help?"

That gets her attention.

"N-No... No..." she murmurs, pulling gently away from you and pausing to wipe the tears from her eyes, "I-I can do it... I can do the things you want me to do, I think..."

Finally, she looks up at you again, eyes gleaming, and utters the second-most beautiful words you've ever heard in your life:

"A-After all... I'm your present, right?"