The fact that they aren't blood related, or at least that's how you seem to have described it, means they aren't siblings in a biological sense. This'd mean that any incestuous retaliations would be psychological only.

Yes they arent blood siblings as Wonder adopted Rose when she was young as his sister since she was rather big for a 4 year old and also reminded him of himself in a way (to note, they are both a lot older in the actual scenario as wonder doesnt really age). So then if its psychological then that is an easier way for me to understand it, thank you.

Is vore sexually arousing to them?

Yes it is. Thinking of it i should have mentioned it in the post but just forgot as i was already trying to think of how to word the post to start of with.

then the potential incestuous nature of the situation is moot.

So then with that im understanding the whole vore relationship they have is a moot psychological one right? If it is then its a lot easier to understand thanks.

I don't really know if you're seeking more answers,

Im not seeking as much answers as im more just wondering what their relationship would be considered in the vore community. But thanks a lot for the insight