Brian looked at her with a bit of worry in his voice.  "I'm going to go get Xy," he said before bounding out of the room.  Of course Xyveris is nearby, and will inform Brian to wait while he checks out his sister.  The door is shut as he comes into the room, shaking his head.  "You need more," Xyveris said simply.  "More doses to keep things down.  Your body is taking it well enough, but that's your first in some hours."  Rather than actually give her a choice, once more he simply grabs her by the hair and pushes his cock against her mouth.<br/><br/>He fucks her mouth for a few moments, her tight throat making him shoot his seed directly down her throat once more.  "If this keeps up we're going to have to start setting up donors or the like," Xyveris said as he pulled his cock out of her throat slowly, wiping the last little bit on her tongue.  "You can't go that long without more cum, human.  Either directly from my cock or in a glass like that from now on.  Keep that in mind."  It walked out of the room, motioning for Brian to go back in again.  "Are you okay now sis?" he asked, worrying.