A Night of Desperate Ladies

"Before you can pee, I want you to fuck the shampoo bottle while you give me a blowjob."

The bottle is quite large, easily 3 times the diameter of even a large penis, but she doesn't even hesitate. She starts peeing before she is even all of the way squatted down, but as soon as the bottle goes inside her, it slows down to a trickle. She grunts, first at the act of her stream getting cut off, then as the girth of the bottle stretches her pussy. As it slides further in, she suddenly stops.

"Oh fuck, normally I could take this, but there's just no room with my bladder there!"

There's another smaller bottle, what should you do?