Use her hands.

"Wait...you don't mean..?" you begin to ask, looking at Katy with eyes wide open.
Katy smiles and nods. "Oh yes. It's exactly what I mean". She runs her hand up to your groin and gives it a soft squeeze.
Leaning in towards you, she presses her lips to your ear and whispers in your ear: "I want to try anal sex, and I want you to pop that cherry".
Biting your lower lip, you need to make an effort to not pin Katy down and fuck her brains out right now.
With a twinkle in her eyes, the sexy starlet looks at you and grins. "I want you to be the one to first fuck my ass."
She seems to know exactly what to say to fire you up, and continues talking while toying with your zipper.

"First, I'm going to get your nice thick warm cock out of your pants..." she whispers huskily, looking into your eyes as she does exactly that. Pulling down your fly,
she pushes her hand inside and works it beyond your shorts. With her hand now gently toying with your dick, she keeps on whispering her tale, the ideas she has for you and her. "Then, when you're nice and hard...I might consider licking it to get you wet enough. Or maybe sucking it..". She lets out a soft moan and grins at you.
"I might get carried away and get you to shoot your seed in my mouth". Katy winks at you. "I've done it a few times, and I loved its taste". She laughs and pulls your cock free
from its prison. You shudder as you member comes into contact with the cool air. "You like that?" Katy asks you. You nod, looking on as the hot girl continues gently stroking you.

"Once you're lubed up...I'm going to take off my pants and have you lick me. Just like on TV" she says with a smirk. Gesturing at the screen, you look at the same thing Katy's looking at: a threesome with two girls and a guy, one of the girls licking the other's asshole to prepare her for anal penetration. "You'll lick my tight little asshole and when I say you're done, you stop and put your cock in me.'. She leans in and kisses the tip of your dick. "You can fuck me until we both cum. I'll let you decide where you shoot that warm seed of yours". Moaning softly, she licks her lips. "Though I'd love it all over my face" she speaks, running a finger over her lips. "Let's get busy"