First request of the bunch! *Confetti falls from the ceiling* ...Yay? This was requested by Rarecasionul,
So kudos to you, for being the first request! May not be what you expected, but hopefully it turned out all right!
As always; this is during the Classic 10 Timeline, so Ben and Gwen are around 11 or 12 now. Enjoy!

Ben let out a loud belch, the type that would normally make Gwen grimace or turn her nose up at him, but she grinned. Grandpa Max had gone
into the local grocer, leaving the two in their hotel room, and Gwen happily decided that she would beat Ben at his own game. She took a gulp of air,
then let out a longer belch. Ben started snickering, an eyebrow raised as his cousin smirked at him. "Beat that, Doofus."
Ben rolled his eyes, then pulled a can of soda from the mini fridge. He gently shook the can, then popped the tab. "Watch and learn, Dweeb."
He chugged over half of the soda, then let out a ten second long belch, louder than his first one. Gwen giggled, then levitated the can away from her cousin. The can glowed as she finished the other half of the soda, then she let out a short and echoey belch. Ben guffawed, then fell on his back laughing. He glanced at the watch, a smirk on his face. "Gonna have to make this interesting..."

He selected Upchuck, then slammed his hand on the dial. His eyes shot open, and he groaned.
Gwen backpedaled away from him, nervousness evident on her face. He had transformed into Wildvine,
bringing unpleasant memories to their minds. Wildvine stepped over to the kitchenette's sink with a sigh, then turned on the water.
Ben shoved one of his vines into the water, soaking up the liquid.
He turned off the water a moment later, a grin on his face.
He turned to Gwen, and let out a large swampy belch. However, instead of grossing Gwen out, it seemed to have the opposite effect.

Gwen giggled, suddenly feeling lightheaded, then stepped towards her cousin. "Whoever thought that such
a gross looking plant monster could smell so nice?" Wildvine shrunk in size, until he was Gwen's height.
"Uh, Dweeb?" She wrapped her arms around him with a happy sigh, then nuzzled his swampy neck.
The watch timed out, and Gwen placed a wet kiss on his cheek. "Hmmm..." She hummed, nuzzling deeper into Ben's neck.
Ben blushed heavily, glancing away from his cousin, then slowly pushed her away. "Gwen, come on..."
She huffed, then shook herself. "Come on yourself!" She glared at him, her eyes slightly glazed.
"Why can't I show my Doofus some affection!?" Ben's eyes widened. "Uh oh."

She stepped forward, grabbed him by the collar of his shirt, then firmly kissed him on the lips. She pulled away a moment later, grinning.
Then she suddenly seemed to snap out of her stupor, she dropped her cousin like a sack of potatoes and backed away,
her hands over her mouth. "Ben!? What the-" She began furiously wiping at her tongue. When she realized how futile that was,
she let her arms hang at her sides with a sigh. "Gwen, it was just an accident." Ben tried to explain, gesturing to the Omnitrix.
"It gave me Wildvine instead of Upchuck, okay?" He glared at the watch. "THAT, was THIS thing's fault!"
Gwen glanced away, silent for a moment. "...Not all of it, Ben." Ben glanced at his cousin, eyes wide. "Huh?"
She sighed, giving him a sad smile. "Remember when we reunited after Gluto saved me?" Ben frowned, his eyes glazed.
"Yeah, I remember." Gwen blushed, her gaze avoiding his. "Well, that hug you gave me... It spoke volumes."
Ben's expression was of blank surprise. "Oh." Either Gwen had come to realize Ben had a crush on her,
or Wildvine's pheromones or whatever, impressed the idea onto Gwen. Ben's expression fell, he turned his eyes to the floor. "Then it's my fault." Gwen guffawed. "How is this your fault?" Ben's head shot up and he glared at her.
"If I wasn't crushing on MY Dweeb, the stupid Wildvine belch wouldn't have done that to you!" Gwen's eyes widened, a blush forming on her face. "Wait... You're crushing on me?" Ben turned away, his face bright red. "...Yeah." Ben tensed up when Gwen stepped behind him,
he tensed further as she wrapped her arms around him. "You're an idiot, Doofus."

She gave him a small peck on the cheek, and Ben suddenly relaxed. His ears began burning as he realized what was happening,
and he glanced at Gwen who laid her chin on his shoulder. She glanced at him, their same colored eyes meeting. "You too, huh?" He asked, a grin forming on his face. Gwen nodded, and Ben kissed her nose. "Then we're both idiots, Dweeb." Gwen relaxed herself, a smile on her face.

Yeah, they were idiots. Idiots together.