A little, short, PruHun fanfic including young Ludwig. First example for the sort of stuff I write. Enjoy~

Elizaveta clang to the warm chest of the man next to her, purring softly and wrapping her hands around his chest. She maybe was small, but he wasn't too large, either, and she could easily reach the other side of him. He chuckled lightly and rubbed his thumb along her back, feeling the thick fabric of her nightgown. His eyes opened slowly as he yawned and looked at the other with an amused smirk.

"Morgen, Liza," He mumbled and raised his hand, playing with her hair.

She pouted and nuzzled onto his chest, groaning tiredly. "Mmm... Shut up, I was sleeping..."

He chuckled once more and kissed her head, shoving his face onto her neck and teasing, "Sure you did... Admit it, you can't even sleep because of me being next to you...!"
"Stop it...! You idiot...!" She grinned and tilted her head back, putting her hands on his chest and tagging his frilly shirt. He laughed softly and placed teasing kisses all over her face, making her grin and push him again.

Suddenly, a voice was heard from outside. "Brudeeeeeeer...!"

They both froze at the spot and looked at the door, hearing footsteps hurrying toward the room. Gilbert pulled away from her and cursed under his breath, "Scheiße...!"
"What are you-" Started the Hungarian, but she didn't even finish the sentence before Gilbert pushed her onto the bed and covered her with the blanket, laying down and trying to look as I nothing happened.

The door shot open and a little, blonde kid hurried into the room, looking at the man in the bed with a worried look. "Bruder, I can't find my book...!"
Gilbert blinked quickly,moving uncomfortably in the bed. Elizaveta gripped his arm, giving him a cold glare under the blanket. He coughed and tried to shake her away, mumbling, "Ja, Ludwig, I'll go find it in a moment..."
Ludwig nodded and blinked calmly, watching his brother chuckling nervously. After few seconds, he raised his head a bit and pointed at a thick foot the stocked out of the bed, saying quietly, "Bruder, Miss Hungary is in your bed."
Gilbert flushed a bit and nodded, trying to pull his hand out of her tight grasp. "Agh, ja, I know...! Dammit... You're hurting me, Eliza...!"
A soft smile covered Ludwig's lips and he hurried out of the room, leaving the two others alone. Elizaveta throw the blanket away and pushed him against the bed, sitting on his hips and folding her arms. He sighed softly and looked away, grumbling, "My brother isn't supposed to know about us."
She shrugged and rolled her eyes, replying, "It really is tough when you keep saying my name in your sleep."
He flushed angrily and tried to pulled his hands that were held under her. "You...!"
She grinned happily and played with his cheeks. "You really are adorable."

He grumbled once more and whined, "Ungaran, get off...!"

A smirk covered Elizaveta's lips and she shook her head and pinched his cheek once more, getting off of him and stepping outside the room.