Tell her to get in the pool

"You can get on the pool there and..."

She interrupts me "You want to do it in the water?"

"Sure! I mean I will get naked too and it's seems really nice."

"What if it gets you know inside?" She asks nervously.

I don't really see that as a big chance her asshole will probably be so tight no nothing can get passed but maybe she got a point.

"Mmmh maybe you right, but we could still do it in the water. Aren't there like a bench under the weather that can keep you up?" I inquire.

"Yes there are but still?" She keeps pushing.

"Then we don't have anything to worry about, trust me. Just make sure to keep you ass over the water level and we'll be fine."

"Okay if you're sure about that. But if there happen any accidents it's you fault." She says as she walks into the water.

Ah so that what's she's afraid of. Well let's not worry about that. I undress and as I turn around to face her and I see...