With the sudden intrusion, Liz can't keep from gasping.  She'd not had enough time to get properly aroused, and the single shove in draws painfully across her inner walls.  However, she does her best  to turn that sound into one of pleasure.  She needs to keep up the act, to keep him from getting anything more than just the most basic of use from this encounter.<br/><br/>"Oh.... yes.... fill me you animal" She's glad he's behind her, or he'd be able to see the mocking smirk resting on her lips.