Liz is almost crying with the exertion to not let herself cum.  Whatever is in his fluids makes it nearly impossible for her to avoid.  Several times she's almost gone over the edge, only to drag herself back at the last second.  Soon she's starting to wonder if it's really worth the effort.  It's at this time that Xyveris's tentacles clamp down on her hard nipples.  It makes her gasp in pain and pleasure, and she momentarily releases her tight grip on herself allowing her to surge towards orgasm and giving him free access to her entrances.