The game gets started.

You seat yourself next to Natsuki on your left and Yuri on your right. Opposite of you is Monica to your left and Sayori to your right.
Monica pulls a gold-cased round from the table, flips the gun open and inserts it into one of the chambers.
Her face lights up in a smile as she pulls up another round, "Let's make it a bit more exciting, shall we?" Monica pushes the round into the chamber next to the occupied one, "We can't make it too easy, can we?"
Yuri rests both her hands on her chest and gasps in excitement, her face red with blush, "N-no.... I suppose we can't."
"Heh," Natsuki scoffS, "Bring it on! I may look small and cute, but inside me is a lion, right?"
"Uhm..." Sayori says, "I don't really mind either way, as long as {first_name} gets stripped naked."

"Am I the only one with some sense here?" You object, "If you load the gun with more bullets, the one who goes first is clearly at an advantage."
"Good point," Monica says, "That would make this unfair... if the one who goes first is selected with an unfair method. But... we'll make it so everyone has an equal chance of being chosen first! That way everyone has the same chance of being placed in an advantageous or disadvantageous situation."
"I..." You look around, clearly outvoted and outmanuevered in the discussion, "...fine, I just want to get this over with."
"Yay!" Sayori says and smiles adorably, "Ehehe, all right, let's get started now."

Monica pulls the cylinder closed and rests the gun on the table, pulling it into a spin that lasts for several seconds; the longest seconds of your life.
When it comes to a stop the barrel points towards Yuri. "
"Ah! Yes! I mean.... I suppose I got first, "Yuri glances towards you, making sure you watch.
She picks the gun up, spins the cylinder and points the barrel towards her chest.
She pulls the trigger.
CLICK!
"Hnn..:" Yuri's chest heaves in excitement and her hand trembles, "Aha.... looks like I managed to dodge a bullet... ah, in a manner of speaking, I didn't mean to make a pun!"
"We are going clockwise, so {first_name}, it's your turn!

Yuri pushes the gun into both of her hands and holds your closed fists before she draws her fingers away. The gun rests in your hands and you look at the weapon.
It's cold to the touch. Lighter than you expected, but also heavy. All of the girls' eyes are on you. You look to them and back to the gun.

Then something occurs to you. They didn't go over the details of the rules, which means you there could be a loophole. They didn't tell you that you couldn't spin the cylinder. In fact since that's what Yuri ended up doing, you might argue that you thought you were supposed to.

Do you take this opportunity and restore the probability to its initial stage, or do you avoid all excuses and display your courage?