Of course they accept. There wasn't any other course of action, Percy's objections be damned. This meeting is what their gruesome defeat has bought them. Neither of the twins are the type to turn and run, and they go nowhere separately. They arrive together in purples and gold, neatly coiffed and prepared for whatever this meeting might be. Even with her human skin to put them at ease, Vax can't completely set aside what he knows she must be capable of. His eyes flick over the one-armed girl, then cuts sideways to Vex.

"We're grateful for the invitation," Vax answers, expression brightening into a smile even as he moves forward. "I swear, I healed faster after reading it and receiving your gift."

Which had scorched a neat circle around his wrist, visible if his sleeve shifts just so.

"I know Vex and I are both glad to have a chance to thank you in person."

His tone is sweet, even if Vax suspects he won't be able to relax a moment while he's in this booth. Even knowing that she's a spider, he's reminded of a dragon when he takes in the opulence of her surroundings.