I'm going to skip Yami Marik vs Yami's Duel since I never liked it, but will write the part with Ragnorok.

Kaiba's POV

If I wasn't careful Zane could easily wipe out the rest of my life points with Moonstone Dragon. So now I had to find a way to bring out another Blue Eyes and lower Moonstone Dragon's attack points. Thankfully, I did have one card I needed, and I had to play it now.

"Sorry, Zane, but your dragon is about to lose its strength." I addressed my opponent and played Shadow Spell.

"Oh shoot!" Zane exclaimed as Moonstone Dragon lost 700 attack points.

"Good move Seto!" Mokuba shouted.

Zane's POV

I had forgotten Kaiba had Shadow Spell in his deck, but as long as he didn't bring his Blue Eyes back out I was still safe. To protect my life points I had Ice Wyvern go into defense mode before having Moonstone destroy Blade Knight.

Now it was back to Kaiba, and I waited to see what he would do next. His next monster was Kaiser Seahorse, and again, I swore because Kaiba was about to use its special ability. My future brother-in-law smirked as he sacrificed his monster and his second Blue Eyes came to life.

"Say goodbye to your Moonstone Dragon! Go Blue Eyes!"

As Blue Eyes unleashed its attack, I smirked.

Erin's POV

The intense light from White Lightning faded, and to everyone's surprise, Moonstone Dragon still remained at Zane's side, and Seto was again surprised. Then Joey whooped, and I saw my brother's face-down card, Scape Goat.

Well played, big brother, I thought.

Kaiba's POV

Zane continued to keep surprising me and I honestly had no idea he had one of Wheeler's magic cards. But with Blue Eyes still on the field and with more monsters I summoned his magic card will eventually be null and void before leaving him wide open. So I ended my turn, and Zane put another monster in defense mode, and his turn concluded.

I summoned Thunder Dragon and had it destroy Ice Wyvern before using Blue Eyes to eliminate the other defense monster. And then, I played my face-down card.

"You wouldn't," Zane paled, seeing Enemy Controller.

"Oh I would and I will"

I sacrificed 1000 life points, and after the command code was entered, the cable latched onto Moonstone Dragon. Then Zane's precious monster was drawn to my side and it was now mine.

"Aww shit"

"Moonstone Dragon get rid of one of those Scape Goats!"

Moonstone obeyed and unleashed its Mirror Flare. One Scape Goat down and three to go.

Zane's POV

"Again well played Kaiba, but Moonstone Dragon unfortunately is returning to me"

I played Dragon Recall, and this allowed me to bring any dragon monster to my side of the field, and Moonstone again was back at my side. I needed to get rid of Thunder Dragon, so I played Poison Wyvern and first used its special ability on Blue Eyes, weakening it by 200.

Kaiba's prized monster roared as it got poisoned. Despite knowing what was going to happen, I had Poison Wyvern destroy Thunder Dragon; since their attack points were equal, both dragons were destroyed.

Erin's POV

This duel was still anyone's game but Zane had the upper hand due to him having more life points. But my mate's Blue Eyes was still stronger than Moonstone Dragon.

Seto drew and told my brother that his Scape Goat was heading for the graveyard and he played De-Spell.

Zane's Scape Goats were sent packing and now my brother was in trouble.

Kaiba's POV

"Now I'll play Silverwing!"

The silver dragoness gave a roar the minute she came to the field.

I was wondering when you would summon me

Sorry about the delay I apologized to her.

It was time I turned this duel around and I was going to that now.

"Go Blue Eyes! Eliminate Moonstone Dragon!"

Blue Eyes roared and attacked with its White Lightning. Moonstone Dragon was hit dead on and Zane went from 3900 life points to 3700. Then I had Silverwing attack Zane directly and Zane went down to 1800. I ended my turn with a card face down.

Zane's POV

Kaiba's eyes went wide as I played Monster Reborn and Moonstone returned to the field. My prized monster may be weak against Blue Eyes but not for Silverwing. My beautiful beast attacked with Mirror Flare, and it seemed the hit was solid, but Kaiba smirked.

"Sorry, but Silverwing missed your attack; now Silverwing, return to me!"

A ripple appeared behind Kaiba and Silverwing emerged from it. She roared and I mentally swore as I saw Kaiba had used Interdimensional Matter Transporter.

Kaiba's POV

This duel was about to be mine. Zane put no cards face down and it was my move. I commanded Blue Eyes to once again destroy Moonstone Dragon and soon it was gone.

"Go Silverwing attack and bring me victory!"

The silver dragoness took flight and then finished the off the remainder of Zane's life points.

Erin's POV

"Good work Seto!" Mokuba cheered as the duel ended.

I gave my Zaldrizes a proud grin before heading over to Zane. He was surrounded by Joey, Duke, and Tristan. Yami and Ishizu left during the duel to look for Tea.

"Holy crap, dude, that was close!" Joey told Zane. "Hell you even had Kaiba flinching a few times!"

Zane chuckled and saw me approaching. Joey, Duke, and Tristan let me have a moment alone with my older sibling.

"That was close indeed" I agreed with Joey. "You did well"

"Thanks, sis, I know it was hard for you to watch, plus dueling against Blue Eyes was cool"

"You certainly exceeded my expectations," Seto interjected, joining us along with Mokuba. "And I look forward to when we duel again"

"Are you sure you're still Seto Kaiba? Because you're not acting like your usual self dude"

Seto gave a small chuckle.

"I'm still myself, but meeting your sister has changed me I won't deny that"

My Zaldrizes then held out his hand to Zane. Zane smirked before shaking it.

A Few Minutes Later.
Still Erin's POV

Mokuba and Zane decided to let me and Seto have some privacy. The next duel was going to be happening shortly and then Battle City would be over.

"Are you alright? You look deep in thought Kitsune"

I turned to my Zaldrizes.

"I was just wondering what's going to happen after the tournament ends, what that means for us"

Seto brought me into his arms and hugged me. I blushed and placed my hands on top of his chest.

"We focus on our future as a couple Kitsune, me being the President of Kaiba Corp doesn't change the way I feel about you"

He then placed a finger underneath my chin and lifted it so I could look into his eyes.

"You have changed me Erin, and for the better"

"Even if I'm a Nine-Tailed Fox?"

My other half smirked.

"I happen to like you as a Nine-Tailed Fox"

He then proceeded to give me a loving kiss, and when it ended, let's just say I didn't like it.