When Happy and Natsu went into the guild, everyone was surrounding them asking questions. "How was the job?" someone asked, "Did you get any info on Zeref?" asked another.
"I'll give you guys a detailed story of my mission later, but right now I need to speak with gramps." Natsu replied happily, although there was a hint of concern in his voice. When everyone started to quiet down, Natsu went up the stairs to the master's office.
"Hey, gramps?" Natsu said as he opens the door to the master's office.
"Natsu, how was the job?"
"About that, um..." And then Natsu told him the whole story, from the fight to the memories and the dark marks. The master didn't interrupt, but kept listening with a thoughtful expression on his face.
"At least we won't have to worry about Zeref anymore, however we need to find out more about these dark marks, we don't know if they're dangerous or not," the master answered when Natsu had finish retelling the day's events.
"I feel fine though," Natsu commented, then everything went dark as the marks start to sting, and the last thing Natsu felt was the hard floor.
