You take it out.

You take a step back,releasing Scarlett's grip and start to unbuckle your belt.
Scarlett squeaks in delight and kneels in front of you.
She glances up at Katy and Katy follows suit.
She places her face next to Scarlett's and looks at you in anticipation.
"Oh Daddy" she purrs all wide eyed "Is it really,really big?"
You undo your belt,unbutton your trousers and unzip your fly.
Your raging hard on springs free of it's confinement,fully erect.
"What do you think?" you grin down at them.
Katy's doe eyes open even wider "HOLY FUCKING HELL!!!" she cries "It's massive!!!"
A smile as wide as the Grand Canyon appears across your face and you watch as Scarlett whispers in Katy's ear.
"You can touch it if you want Katy,I'm pretty sure he wouldn't mind"