Okay I'll try to add more to this chapter .. Some devil fruits in this story are made up by me. Not real. I don't think they've ever been in One Piece.
Hope you like it , Review please :) Might Contain Spoilers.

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Chapter 3 -

As Luffy opened the door he could'nt believe what he saw in front of him ..
A big pink room filled with teddy bears and dolls. Nearly everything was pink!
There was a girl around 18 with long purple hair and big brown eyes. She wore a lovely pink dress.
In the corner of the room there was a big kurosaki cage and inside it was .. CHOPPER!
He was lying unconsious .. There was no marks of injuries on him from what they could see.

"OI CHOPPER WAKE UP!" Screamed Luffy "Don't worry he's just sleeping" the girl grinned "What did you do to him?" shouted Nami "Nothing we just threw sleeping gas towards them and they slept .. he should naturally wake up in an hour"
The girl turned and stared at Luffy for a second and something in her head clicked "Monkey Chan, what a pleasure ! My name is Oka , i've been waiting for two years to meet you!"
"O-ka? I never heard of you"
"Luffy how does she know you?" Nami curiously added "I never met her .."
"Oh you don't know me but I know you very well Monkey D Luffy" she turned and looked at Nami and walked over to her "Cat Burgular Nami, the so called Navigator" ..
Nami saw the hatred in the girl's eyes as she stared at her "Do you have something against me?" added Nami "Yes I do. Your a woman and Monkey Chan is a male therefore if I will live with Monkey Chan you must be erased from his life."
"WHAT?" Luffy and Nami shouted together "I don't want to live with you!"
"Why do YOU want to live with Luffy?"
"I love Luffy I always have ever since that day .."
"What day? I don't know you!"

Suddenly Arashi spoke from the tone dial "To save your friend you have to beat Oka - Good luck with that"
"I'll fight you .." demanded Nami "What are you talking about Nami?"
"Stay out of it Luffy."
"Oh yes, you didn't expect me to fight my future husband did you?" giggled Oka

Nami's eyes were staring straight into Oka's. The jealousy in her eyes were lit up.
Luffy stood back respecting Nami's order to not interfere.

All of the sudden Oka started lifting her hands and waved them around

"What is she up to?" Nami thought "BUDO STRAP!" Oka shouted Vines came out of no where straping itself around Nami's waist, tightening its grip.
"I ate the Budo Budo no mi (Vines Vines Fruit) your no match for me."
"A devil fruit user?" Thought Nami "I gotta get myself out of here"
"Nami!" shouted Luffy "Stay out of this Luffy, its my fight .. "
Luffy stood there feeling helpless. He wanted to just jump in there and help her but he respected her and stayed loyal to her demand.
Nami could barely reach her pocket but did and got out a pocket knife. She managed to cut the vines and fall out "I can't beat her with a pocket knife .. I just have to avoid the vines and focus on hitting her. I'm not losing Luffy to someone like her!" she thought "FOG TEMPO!" Nami shouted as fog appeared everywhere. She ran to the other side of the room where she used her next attack "COOL BALL ... HEAT BALL ... THUNDERBOLT TEMPO !"
As the fog went away Oka raised her head and found a big cloud over her head "What's - " but she was cut off by a bolt of lightning comming down and stricking her sending shock waves all over her body Oka could barely stand, the shock effected her completely including her attacks "Don't think I'll give up that easily, BUDO DEATH KNIVES!"
Knives were flying towards her but Nami quickly doged them but got hit twice in her left arm. She fell down in pain.
"NAMI!" Luffy cried worried about his navigator Oka walked towards her standing right above her "This is the end for you darling .. BUDO-"
"Don't take me by lightly ! GUST SWORD!"
A bubble came out of the climatact which burst and made a whirlwind come out throwing her to the other side of the room.
Nami got up and reached for the key in Oka's pocket ..
"Nami! That was amazing ! You improved so much ! As expected from my navigator!"
"Thank you Luffy .. " Nami giggled turning red ..
Luffy grinned his usual wide grin. As they were about to open the cage "Thank you" said Oka The two looked curiously at her as she told them "Before you came here I was mind controlled by one of the people hear to fall in love with Luffy and my love for him will kill him, but if you can beat me the spell will go away, and you did. Thank you."
The two smiled at her and moved on to Chopper.
"Oi Chopper, wake up" said Luffy "Mmm what's wrong?" he said Luffy and Nami's faces lit up with happiness. Nami jumped to hug Chopper and she was smiling at Luffy as she did it.
"What happened?" Chopper asked "Long story, now come one, we'll explain as were going!"

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See what happens next when Nami and Luffy meet they're next opponent!

Review please and I hoped you like it :)