She gasps again as she feels the rush of liquid inside her.  It feels almost boiling, and there's so much of it!  It fills her until she can feel her belly start to bulge ever so slightly with it''s volume.  While she lays there, amazed at the sensation of being so completely filled, her mouth starts work of it's own.  Whether due to the fact he told her to, or that she's so close to her own orgasm, or for some other reason entirely, Liz starts to suck on the tentacle stuffed into her mouth.  It isn't until the thing begins to spurt down her throat that she realizes what's been happening.  And by then it's too late.