Eren does not seem to realise the implications of what Paul just said.
The chest ripples and distorts, growing upwards into the shape of a female human with blue hair. And quite a, um, chest.
[spoiler]Alternate Form: varag, + Mimic Shape and disguise self[/spoiler]
"Right, shall we get going?" she asks.
"...but first," she points in the direction of Kyx. "The invisible guy's with you, right?"