That hint of a smile on Joshua's face is more than a little amused now, at Rose's wordplay. Witty, isn't she?

Joshua spots the tunnel as much as he spots anything else they pass, but since he...doesn't actually know what a vagina looks like, the imagery is lost on him.

He pauses for a moment on the stairs as she pushes the door open. "Auspicious outcomes for whom, if you don't mind my asking?" He's still just as polite as ever, but there's a faint undertone of wariness in his tone and demeanor.