Get her naked and get physical

Time to ham up some acting!

"Oh no! This means we're sleeping together! Oh the only way this could get worse is if you sleep naked! That and you just impale your ass on my dick! Thankfully, you won't do that, or make me undress you." You act to the best of your ability.

Sarah looks at you with an evil grin the whole time you were talking, enjoying your 'misery'. It also had the desired effect. She gets off the bed to close the door and drag you to the bed.

"Unfortunately for you, you don't get a say in what happens next. Now take these off of me." She says, like she's in full control of the situation. She then sits on her knees on the bed to present herself to you, ready for you to unwrap her like a present. Huh, seems like your birthday came early this year.

You grab the strings on her shoulders and pull them down, gazing at her as her bare breasts come into view. The sight causes your penis to harden and come to full mast. You pull her night gown down to her thighs and lean back. She snaps her fingers and point down at her panties, wordlessly ordering you to remove those too. You happily obey and pull those down too, her pussy on full display like the rest of her body. You feel like your penis could penetrate metal with how hard it shot up.

Sarah then pins you to the bed and starts crawling backwards to your crotch, with her face close to your member as she stops. Then she grabs your shorts and underwear, ready to pull them both down at the same time. She looks up at you with the same grin as before.

"I have you right were I want you, in the corner, too scared to even react! Now, lets see that tiny little di-" Sarah says until she gets interrupted by your cock slapping her in a face as she pulls your cloths down. She's frozen in shock by the sight of what just hit her in the mouth. It seems she was expecting you to be a much smaller size. You can't help yourself as you grin, trying to cover your mouth with your hand to hide it.

"wha- huh. Its big! You're big! WHY ARE YOU BIG!?!?" Sarah almost screams before covering her mouth. Thankfully it wasn't too loud. She measures your length before turning around away from you. You're guessing she's trying to measure how big it'll be inside her. You honestly never seen her so nervous before, and you're enjoying every second of it. You wonder if she'll go through with it or not as you see her glance at your shaft. Her eyes filled with a mix of worry and arousal.