Tea's Little Sister ~Mokuba Kaiba~[Book 1]

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Meanwhile, Tristan and Jill were on their trek to go look for Kaiba, Mokuba, and Lea. 
"What have I gotten myself into? This castle is humongous!" Tristan exclaimed, quietly.
"I know, Tristan, but we have to keep looking." Jill replied, a bit reassuringly. 
"I know, Jill, but this is worst than trying to find your friends down at the mall. There's no sign of Kaiba, or Mokuba, or Lea, or anyone else down here." Tristan replied doubtfully, and before Jill could open her mouth to retort, they suddenly heard laughter. 
"I spoke too soon!" Tristan exclaimed, before both he and Jill quickly tried to find a place to hide before they could get caught. But luckily, Tristan began wearing the suit of armor that acted like it was standing guard, and Jill hid behind him. After one Security Guard passed by the pair, they both sighed in relief but they still looked at him in alarm until he was out of sight. 
"Time to change shifts. How are the little twerps?" They both heard the Security Guard ask. 
"The same as ever, glad they hadn't jumped. Heh, you don't have to worry about them runnin' off, and even if the girl's soul is not taken, she'd never leave him because she loves him." They heard another man reply. Jill scowled when he just mentioned Lea. 
"Of course not, but you know you still have to be careful, they're Pegasus' pet prisoners." The Security Guard warned.
"Half, shamf. I'm outta here!" The other man scoffed. 
"Catch you later." The Security Guard bid goodbye. 
"Right." The other man nodded, as he walked on his way. 
As soon as the man, who was also a Secuirty Guard, walked on his way, Tristan spoke quietly to Jill, "I'm on the right track." 
"Right, he'll lead us to Mokuba and Lea." Jill nodded, before Tristan felt he was free to move now, but the suit of armor was really heavy for him to walk with.
"Boy, this armor's heavy!" He remarked, which made Jill giggle a little as she took out her handcuffs from her pocket. 
"I think you can cuff me now, Tristan." Jill told him, before Tristan took the handcuffs out of Jill's hand and began putting them on her wrists. 
"Do you have the key to unlock the handcuffs when this is all over?" Tristan asked, before Jill nodded. 
"Don't worry, Tristan. I've got it all covered." She reassured, before she and Tristan continued on their trek. 

As the pair stopped walking, Tristan lifted his mask up to see where they were at, and he and Jill were surprised to see that they didn't see the same man who passed by them a minute ago, and all they saw was a statue of a dragon. 
"Where did the other guard go? This is a dead end! There's no where he could have gone. How strange." Tristan commented, slightly confused. Then he and Jill walked towards the dragon statue, but Tristan suddenly tripped when he could feel the floor going down a little, which caught Jill in surprise, and before he could fall forward, he quickly grabbed on to the dragon statue to prevent himself from falling and when he did so, he pulled the statue down and what suddenly happened in front of their eyes was the wall opening up. Both Tristan and Jill seemed amazed at the sight. 
"What?! A secret tunnel! But where does it lead?" Tristan asked
"This is probably where Lea and Mokuba are at." Jill answered, before she began running down the tunnel. Tristan was a bit confused, but he shrugged and began following Jill. 
Tristan sighed and said, "With a secret staircase and all, they gotta be hiding something down here." 
"Maybe, but who knows what's down here?" Jill shrugged, before they heard a male humming. 
"Man, this is like the most boring detail ever. I mean what's the point of guarding those kids? Without his soul, he's a total zombie!" The Security Guard snarked to himself, before he eyed Lea, who was inside the dungeon with the soulless Mokuba, holding him in her arms, not wanting to let him go. 
"And as for you, little girl!" He called Lea's attention. 
"What do you want?" Lea demanded, sounding like she didn't want to talk to him. Both Tristan and Jill's eyes widened when they just heard Lea's voice! 
"I just wanted to ask you, why did you decide to stay in here with the kid? Is it because you're in love with him?" The man asked her, but Lea huffed at the question. 
"I have nothing to say to you!" She snapped, which made the Security Guard shrug.