Next part! :)

"Senpaiii," Fran droned as he went down the hall. He peeked into Bel's room. "What is the spoiled prince doing?"

A knife landed in the wall beside his head. Bel advanced forward and pulled Fran into the room, slamming the door shut. "Ushi~ The prince is going to play with his Frog."

"Ah, now, Senpai?" Fran groaned. "The Vongola kid is meeting the boss tonight. We're supposed to be down there."

"We have time," Bel said, grinning.

He pushed Fran down on the bed and started stripping him. Fran sighed dramatically.

"I'm not even in the mood," he said.

Bel paused and looked up at him. "Is that a challenge?"

"What? No-"

Bel pounced on him. He leaned down and Fran shivered as his hot breath tickled his ear. "You know very well that you're always in the mood, whether you admit it or not," he whispered.

Fran blushed scarlet and Bel giggled.

"That's what I thought," he said smugly.

Fran sat up on his elbows and glared at him. "Just hurry up."

Bel grinned and kissed him. He stripped them both down to their boxers. He moved Fran into his lap to grind their growing erections together. Fran moaned and buried his face in Bel's neck. He nipped and licked at his skin and it was Bel's turn to shiver.

"Froggy," he gasped.

The door suddenly flew open and in ran a five-year-old Lambo with Tsuna chasing after him. The two on the bed froze and Tsuna lunged forward and grabbed Lambo. Out of Lambo's hair flew the 10-year bazooka and it hit Fran. There was a cloud of pink smoke.

"Hieee!" Tsuna cried. "I'm so sorry! The bazooka went off and now I'm stuck with the 10-year younger Lambo!"

Lambo laughed manically, too young to understand exactly what was going on. Bel pulled out a knife and pointed it at them.

"Get out," he growled.

Tsuna grabbed Lambo and ran out the door. Bel looked up at Fran who was still on his lap and his eyes widened. Fran looked different somehow and he had clothes on. He looked older and his hair was a bit longer. He had a scar on his cheek.

"What… What happened…?"

"Ahh, Senpai," Fran said. "You haven't heard of the 10-year bazooka yet, have you?"

Bel looked dumbfounded.

"I'm Fran 10 years from now. I switched places with my younger self."

"Switched places…" Bel said blankly, then he looked upset. "Will I get him back?"

Fran smiled slightly. "Yes. The switch usually lasts about five minutes."

Bel looked relieved. Fran took a hold of Bel's chin and studied his face.

"I forgot how cute you looked when you were younger," he said.

Bel could only stare back at the older Fran. Where had he gotten that scar?

Fran ran his fingers along Bel's neck and he shuttered, but kept still. Fran's smile widened.

"You used to be so sensitive too," he said.

"W-Wait. Used to be?" Bel asked hopefully.

Fran nodded. "You've gotten used to my touches by now. However," he paused. "I still know all the places to touch you to get you off." He leaned down and sucked on Bel's collarbone.

"Nngh!" Bel cried. "S-Stop." He pushed Fran back.

"What is it, Senpai?" Fran teased. "I know you like it." He grinded his hips down onto Bel's semi-hard cock. "You and my younger self seemed to have been up to this sort of thing before we switched."

"B-But- I can't do this with someone else," he said. "You may be Fran, but you're not my Froggy."

Fran snorted. "I can guarantee my Bel is having his way with my younger self as we speak, the pervert."

Bel growled. "He better not touch him."

"What does it matter? He's you."

Bel said nothing and Fran sighed.

"Fine." He slid off of Bel's lap. "You're so loyal…"

"Shouldn't you be happy about that?" Bel snapped.

Fran smiled again. "Yes, but you can't cheat on me with myself. That doesn't even make sense."

Bel frowned.

Fran checked his watch. "Plus, I was kidding. My Bel wouldn't want me touching you. Anyway, we don't have much time, so why don't I tell you a few secrets?"

"Secrets?"

"About me," he said. "Sexual things."

"Okay," Bel said eagerly.

Fran suddenly hesitated. "No… never mind. You should really find these things out on your own."

"No way! Tell me," Bel demanded.

"It's embarrassing," Fran groaned. "What was I thinking?"

"You have to tell me," Bel said. "I want Froggy to feel as much pleasure as possible."

Fran's cheeks turned pink. "Maybe I should tell you… It is a while before you figure this stuff out… I mean I didn't even know."

"What is it?" Bel cried. "Don't leave me hanging."

"Fine," he said. "I'll tell you three things. Only, because my younger self will benefit from this."

Bel leaned forward, impatiently.

"First off, I actually really like being tied up," he said.

"Tied up?" Bel asked. "We've never tried that."

"Try it," Fran said. "You don't even have to tell my younger self that I'm telling you this stuff. Just do it."

"Okay, What's the second?"

"Well… I'm super ticklish on the back of my knees."

"Yeah?" Bel asked surprised.

Fran sighed. "I can't believe I'm saying this, but tickle me there and you'll be able to make me do whatever you want."

Bel grinned.

"And the third… This is completely embarrassing," he said turning bright red. "But you don't try it for the longest time…"

"What is it?!"

"I… I um, really like being licked down there…"

"Huh?"

Fran's cheeks turned even darker. "You know… There."

Bel's eyes widened and his cheeks turned pink. "Oh."

"Yeah…"

"I've wanted to try it, but I wasn't sure if you would like it," he said.

"Oh, I like it," Fran said. "Trust me."

"I'll try it then," he said. "Why do you like being tied up?"

Fran looked away. "What kind of question is that?"

Bel shrugged. "I'm curious."

"I just like when… Well, my Bel takes complete control. It's sexy. I like that I can trust him to take care of me."

"Does Froggy trust me that much?" Bel asked.

Fran bit his lip. "Of course he does. You mean everything to him."

Bel looked taken aback. "Y-Yeah?"

"I shouldn't say anything else," he said. "Most things you should find out on your own."

"No, no. Tell me more," Bel said.

Fran shook his head.

"At least tell me where you got that scar," he said.

Fran put his hand over the scar on his cheek and his eyes darkened. There was a puff of pink smoke and the older Fran disappeared. The present Fran appeared in his place looking disheveled.

"Senpai!" He cried.

Bel cupped his face in his hands. "My older self didn't touch you, right?" He hissed.

"N-No!"

"Che. He better not have," he said. "Are you okay?"

Fran nodded. "Wait… Did my older self try anything?"

Bel shrugged. "We didn't do anything."

"I think that might have been the weirdest thing that's ever happened to me."

"Me too."

Fran crawled into Bel's lap and snuggled there. "What am I like in the future?"

Bel grinned and wrapped his arms around him. "Shishi. A very, very cute kohai."

"Cute?" He said indignantly.

"What about me?"

Fran's cheeks turned pink. "You're different…"

Bel quirked an eyebrow. "How so?"

"You have some facial hair and it makes you look really sexy," Fran admitted. "And your personality. It's changed a lot."

"Changed?" He asked, confused.

"You weren't wearing your crown and you kept calling me Fran instead of Froggy."

"Not wearing my crown?!" Bel cried. "Why the hell not?"

Fran shrugged.

"Ugh. My future self isn't acting like a peasant, is he?" Bel sneered.

"No, Senpai," he droned.

"What did I say to you?" He demanded.

"First he explained to me what the hell was going on. Then…" He hesitated. "Well, he, uh, looked me over."

Bel growled.

"I couldn't exactly stop him!" Fran cried. "I was only in my boxers! He kept saying I was so cute when I was little."

"You said he didn't touch you!"

"He didn't!" Fran said quickly. "He- you said you wanted to, but you knew my older self wouldn't like it. I'd be jealous."

"What else did I say?"

Fran blushed a little harder. "He gave me some advice… or tips, I guess."

"On what?"

"Blowjobs," Fran said.

"Ehh?" Bel exclaimed. "Show me."

Fran rolled his eyes. "You want me to give you a blowjob right now?"

"Yes," Bel said. "We were about to have sex before. I'm still horny."

"Okay, fine," Fran laughed lightly and kissed him.

Bel deepened the kiss and pushed their cocks together. Fran pressed against him, enjoying the feel of Bel's chest against his own. Bel's hands crept down into Fran's boxers and he cupped his ass. Fran purred in delight and grinded his hardening cock harder into Bel's. Fran soon pushed back against Bel's chest.

"Let me show you what I learned, Senpai," he said, his eyes darkening with lust.

Bel groaned as Fran slipped from his lap and pulled his boxers down.

"Lay back," he said.

Bel did as he was told, hissing as he felt Fran's hot tongue licking him. Fran licked all along the underside and then up to tease the tip. Bel gripped the sheets tightly. Fran suddenly took him whole and he let out a strangled gasp and arched his back. Fran hummed around him and started messaging his balls. Bel tugged on his hair and he pulled back. Bel sat up and ripped Fran's boxers off.

"Come here," he ordered impatiently. He turned him around and pulled his backside to him.

"W-What are you doing?" Fran asked, breathlessly.

"Ever heard of 69?"

Fran nodded and placed himself over Bel. He immediately took Bel's cock back into his mouth. Bel sucked on his fingers and teased Fran's opening with the first. He pushed it inside and Fran moaned around his cock. Bel stretched him with one, two, then three fingers. He took a shaky breath as he tried to control himself. Fran was deep throating him, his head rubbing firmly against the back of his throat.

"Fuck, Froggy," he groaned. "You're amazing."

Fran hummed happily in response.

Bel rubbed Fran's cheeks gently before spreading them again. He hesitated slightly, before leaning forward and giving his hole a tentative lick. Fran let out a shriek of surprise and released his cock.

"Bel!" He cried, his cheeks beet red. "What are you… ?"

"Trust me, Froggy," he said. He leaned forward and gave his hole a firm lick.

"Gah!"

He licked it a few more times before swirling his tongue around.

"Nngh! God, Bel!" He moaned.

Bel pressed his tongue inside and thrusted it in and out. Fran dropped his head against Bel's thigh, completely forgetting about the other's cock and bit him to keep quiet. Bel jolted slightly and continued to work his tongue.

"Fuck, Bel, fuck!" Fran gasped. "I can't- it feels too good-"

Bel reached forward to stroke Fran's cock and he came almost instantly.

"Belll," he whined. He was shaking all over.

Bel released him and he turned himself around weakly. He was too embarrassed to look Bel in the eye.

"I've never made you cum so fast before," Bel said, pleased.

Fran nodded. "You've never licked me there either…"

Bel grinned. "You liked it. I'll have to do it more often."

Fran hid his face behind his hands and Bel laughed.

"I was supposed to be giving you a blowjob," he said, voice muffled behind his hand.

"Shi~ I know. You were doing a great job, but I couldn't wait," he said.

"Hm," he grunted and moved his hands away. "May I continue?"

Bel snickered and nodded. Fran moved between his legs again and pumped his cock. He swirled his tongue around the tip and then sucked on it gently.

"Mmm, Froggy," Bel whined. "You're teasing me."

Fran chuckled lightly. "I'm just following your advice."

"His advice," Bel grumbled.

Fran responded by taking Bel's cock deep into his mouth and Bel groaned. He fisted his hands in the sheets and tried to keep his hips still. He knew if he moved too much he would choke him. His cock was soon pushing against the back of Fran's throat again.

"F-Fuck," he gasped.

Fran ran his fingers lightly up Bel's inner thighs and he twitched under his touch. He started bobbing his head a little faster and used his hand to pump what he couldn't reach with his mouth. He used his other hand to message Bel's balls. Bel cried out a few incoherent curse words as he shuttered against the onslaught of pleasure. Fran took his hands and suddenly scratched them down Bel's inner thighs and Bel jolted, his back arched, and he came flooding into Fran's mouth with a loud gasp.

Fran sat back, grinning as he wiped cum from his mouth. Bel could only lie there panting. Fran sat up and placed light kisses on his chest making him shiver. He kissed Bel on the mouth and pushed his tongue inside. Bel groaned as he tasted himself. He wrapped his arms around Fran and pulled him down against him.

"Did my older self tell you to scratch me like that?" He asked breathlessly.

Fran rested his chin on his chest. "Yeah. Did you like it? You came so fast."

Bel bit his lip. "Sorry about that. I didn't know I was that close. It felt amazing though."

Fran grinned again. "I don't mind. He, you- whatever, told me I always liked to do that to you. Your thighs are so sensitive."

Bel pouted. "I wish they weren't."

Fran kissed his chest before resting his head on it. "I like it."

"Hmph."

"So are you going to skewer the Vongola now too, Senpai?"

Bel snickered. "I think I'll let him go. He really did us a favor, but Luss is still going to get it when he comes back."

"He's been gone for like a week," Fran said. "He's afraid to come back."

"He should be," Bel grumbled.

The older Fran stumbled as he was returned to his own time period. He found himself back in Bel's room. Said prince was sitting on his bed, grinning.

"How was your trip, Fran?" He asked.

Fran stepped forward, frowning. "What are you grinning about? What did you do to my younger self?" He asked suspiciously.

"Shishi. You're so paranoid," he said. "What did you do to my younger self?"

"Nothing!"

"Liar," he said simply.

Fran bit his lip. "Your younger self didn't even want to do anything with me."

"Oh?" Bel snickered. "Was he not pleased with how you turned out?"

"I guess not…" He grumbled.

Bel's grin widened and he pulled Fran into his lap. "You know that can't be true. You're so sexy." He wrapped his arms around him and placed gentle kisses along his cheek and jaw. "My younger self isn't stupid."

"Hmph," he grunted as Bel's afternoon shadow tickled his skin.

He looked up so he could kiss Fran on the lips. "I love you, Fran."

"I love you too, Bel."