This is based off a random theory that came into mind in my school bathroom. It would explain a lot about what happens between Mest and Wendy in season 3. I hope you guys enjoy this story.
Wendy woke up in Lucy's bed. She sat up and Lucy yelled "NATSU THAT BETTER NOT BE YOU IN THERE.". Wendy gasped as Lucy's bathroom door flung open and Lucy appeared wearing a towel and a hair towel. "Oh it's just you Wendy." Lucy said, looking surprised. Wendy nodded. Lucy smiled and asked her "How did the job go yesterday?". "It was really cool. Me and Natsu defeated most of the guards, Gajeel seemed very lazy. Panther Lily helped out as well" Wendy explained. Lucy chuckled "Did you guys manage to destroy the emerald?". Wendy nodded. Carla flew into the apartment through the open window. "Thank goodness you're alright Wendy. You shouldn't have gone into the trouble of trying to kick that guard in the..." Carla paused as she was about to curse. Instead she just sighed and said "Butt". Lucy burst out laughing when Carla said butt. Carla huffed and turned back to Wendy. "There's someone that would like to see you in the guild hall." she said before flying back out the window. Who could want to see me? Wendy thought. She quickly got out of the bed and walked down the stairs. On the way down, she encountered Lucy's landlady. "Is Lucy Heartfilia in the apartment you just came out of?" the landlady asked. Wendy nodded and continued her journey to the guild hall. She entered the guild hall to see a bunch of her guildmates talking to a man with black hair and a scar that seemed familiar to Wendy. Natsu walked over to Wendy and said "That guy over there wants to talk to ya. Me and Happy are going on a job. Hopefully you'll catch up later". Wendy nodded and watched as two of her friend left.
She walked over to the man and said "Hi, you wanted to see me?". The man's eyes widened when he saw Wendy. He stared at her for a couple of second and said "Wendy? Do you remember me?". Wendy shook her head. She had no memory of this man. "It's me, Mest." the man explained. Wendy suddenly remembered why his scar seemed familiar to her. She remembered what happened to Tenrou Island. She gasped and asked "But why did you come here?". Mest sighed and explained "I have something I must tell you, please come with me". Wendy followed Mest to the Magnolia river. They stood on the bridge and Mest started of by explaining "I was too embarrassed to say what I need to say in front of your friends. I mean, what would you expect from a father?". Wendy took some time to think about what he just said. She narrowed it down to two possible outcomes: Mest was her father OR Mest knew her father was. "What do you mean?" Wendy asked. Mest sighed and said "I am your father...". Wendy gasped.
"No, that can't be true. The only parent I've ever had is Grandeeney." she explained. Mest sighed and said "We'll talk more about it tomorrow. I know it can take a while to get over this kind of thing.". Mest then turned around and walked away. Wendy began walking towards the guild hall. She kept on telling herself that Mest was lying just like on Tenrou Island when he revealed his name to be Doranbolt. She didn't want to fall for any of his 'tricks' again. She came back to the guild hall and sat down with Lucy and Carla. She remained silent as she was too busy in her own thoughts. Could what Mest had said be true? Wendy suddenly felt a tap on her shoulder by Carla. "I just wanted to let you know child, Natsu and Happy are fishing if you wish to join them...but don't be getting into any trouble.". Wendy nodded in agreement and walked into the forest where Natsu and Happy went fishing. She was wandering around trying to find her friends when two masked people popped out of the bushes and started attacking her. Wendy was exhausted from running and was too tired to fight. The people were about to take her away when Wendy saw two figures fighting against them. She opened her eyes to see that it was Mest and Romeo fighting against masked members of a dark guild. She hadn't seen their guild mark before and was too tired to work it out. Once the fighting had stopped a different fight commenced, Mest had begun arguing with Romeo. Wendy sighed and watched this wasteful fight.
"What are you doing here? Trying to impress my daughter?" Mest started off the fight with. Romeo growled and replied "No, I'm just trying to protect my fellow guildmate.". Mest didn't believe him and the argument continued. "So you were trying to impress her!" Mest chuckled, trying to pull Romeo's leg (not literally, it means he's trying to tease him). Romeo began to blush but tried to hide it with anger. His anger got too out of hand and threw a dragon fart flame at Mest. Mest teleported behind Romeo before the flame could hit. He slapped Romeo in the face. This angered Wendy and she stood in between the two. "Stop fighting both of you!" She growled. The boys stopped. Wendy quickly went back to the guild hall and sat down by herself. She buried her fingertips in her hair. This was strange to her. Romeo and Mest fighting was just a piece of it. Then all she remembered was it all went black.
She had fainted due to her tiredness. Carla noticed the sleeping Wendy and took her to the sick room of the guild hall. She sighed and flew back down the stairs. Carla then froze as she had a vision of the untold future...
I hope you guys enjoyed the first chapter of my first Fairy Tail story. It's been a while since I started a new story so I decided to write this.