Big Mom clenches her fists and a grin spreads across your face slowly.
"I always wanted to fight a Yonko!"
"I-Is this guy serious?! He's so dead!"
"Who cares? If we don't do as Mama says we're the ones who'll die Zeus! Now kill him!"
"S-Sorry kid..."
https://www.youtube.com/watch?v=9_S2X2171hs"ZEUS! PROMETHEUS! No pancake... no mercy!"
Mama raises both her hands with one homie in each. The two grow more vicious by the second as they prepare for the fight.
Since this is an emperor you're talking about you have no intentions of holding back. Jumping at Big Mom you muster all your strength and take the first swing.
"Silver Style: SILVER VOICE!"
Mama quickly reacts by moving her right hand which has the living sun in it.
"HAH! IDIOT! I'll burn you to cinde-AAAAAAAAAAAAAAAAAAAAAAH!"
"P-Prometheus? What's wrong?!"
"MELCAHIM!"
"Aaaaaaaargh! YOU!"
The sun is frustrated because the heat emanating from your body dwarfs his. So he can't harm you but also you can't hurt him either even with armament. In truth he might as well not be here. But Mama... Mama is different. As you push against her you start using everything at your disposal, even blasting her with your Conquerors haki. She instinctively does the same and the resulting clash rocks the very ground under you. Unfortunately it doesn't look like your hit didn't even scratch her.
"ZEPHONIM!"
With your powerful legs you kick yourself off her. Your ears prick up as you hear her attacking from the other side with the thundercloud. She swipes the air where you are and unleashes the lightning under her control. Several buildings in the vicinity crumble from the discharge. Mama smiles as she assumes you were turned to ash.
"UP HERE! RAZIELIM!"
Angered by your continued existence she fires jets of fire and bolts of lightning in your direction. By closing your eyes you focus and get a feel for her attacks. You fly higher in the air while dodging around the projectiles. Once you gain enough ground you turn around and dive towards the ground.
"Double shift: DUMAHIM!"
A cone of fire forms around you as you reach terminal velocity and go past it with a few wing flaps. Pulling back your fist you prepare to punch Mama with even more force than you can muster on your own.
"Silver Starfall!"
Mama tosses the cloud aside and coats her own hand in armament. Upon clashing with her the ground caves in but her arm doesn't even budge. With her mouth wide open and salivating she discards the sun too and calls for her hat.
"NAPOLEON!"
Her hat pops off and turns into a sword before flying in her hand.
"YES MAMA!"