She gets down to business.

"So...have you ever been fisted?" Becca asks bluntly after seeing your ease in taking her cocks.
"Nope, but the size might not be a huge stretch," you tell her as she pulls out with an audible popping sound.
"Ok, but if you are lying, you are gonna wish I was shoving my foot up here," she declares. Her largest cockhead finds its way between your legs as it hardens to reinforce her threat. Meanwhile another cock pushes its slippery head into you. It starts small, but you know this is going to be up to the thickness of her arm. The design is perfect. By the time it widens to its full thickness, you are ready. Then this one leaves and is replaced by one with a wider head. Then along side it, the previous one.
"Double fisted?" She slides in at the same pace. These two are so thick they are prying your buttocks apart. She bottoms out, then pulls out immediately before you can adjust. The next one parts your butt all by itself. It feels like you are sitting on a fence post with how far you part.
"I wasn't ready..." you trail off.