Liz follows the command, not that there's much else she can do.  With his member stuck so far down her throat it's all she can do to keep from choking, let alone try and reject the fluid spilling from him.  She feels the heat and heaviness in her belly once more, the pressure building as more and more of the stuff is expelled into her.  Then finally it's over.  She feels like she's eaten far too much, her stomach trying to reject some of it.  But again she simply can't.  She's stuck with the mass deep inside her.  She scoots away from him, moving so her back is against the headboard.  Hopefully he's done for now...