Peter is far more perceptive that most people tend to give him credit for. It works to his advantage quite a bit, actually. He has a unique way of looking at things and other problems that get thrown his way and it typically gets the job done. That being said, a twin was not what he was expecting. He supposed Buttercup had never explicitly stated she didn't have a twin sister and he'd never asked. Probably because not only was an orphan but he was an only child so in his mind he thought she was probably an only child as well.

A twin though. He's heard rumors that twins are extremely close and some people even believe they have some kind of psychic connection. There are so many things he suddenly wants to ask but he could tell by her tone and the way she curls in on herself that this is something monumental that she's revealed to him. Her words are extremely telling though 'Did be having.' There are still some moments where Peter has to repeat what she tells him in his head to figure it out but past tense is still past tense-she lost her sister somehow.

Again, he just wants to scoop her into a hug and protect her from all the bad thoughts he knows she has.

"A twin." He says, trying to fight the way his eyes are starting to water a little-he can't even imagine- "That's cool."

That's a lame thing to say but he's doing his best to not break down and cry for her because he's pretty sure she wouldn't appreciate it. "M-maybe... I mean time doesn't really work the same here, right? Maybe-Maybe you're sister will turn up. And you can give her a name-maybe something to match yours, you know? since your sisters? What about like... Lily or-or Daisy?" He really needs to learn how to not ramble.