Why even dress up as you're sister?
So what if your ear wasn't pierced, how does that link back to you?
Such questions are irrelevant, just tell your logic to fuck off and look at the boobs and whatnot.
@AnacondaHL I once dated a twin. It's actually important to be able to distinguish the two. To them self identity is something that is ever present. And to acknowledge them uniquely results in them viewing you very favorably.
Also, people, stop using NTR to discuss a love triangle. NTR refers to cuckoldry not 3 way romance triangles like this.