A/N: A prompt fill for the amazing futurerustfuture-dust!

Loki pulled Natasha close as they settled together on the couch for their usual evening routine of relaxation time. She curled up to his chest before carefully opening her book. Loki had a tome of his own, and began to hum as he skillfully opened it one-handed while his free hand played with Natasha's curls. His fingers absently brushed against her neck, lightly tickling her silky skin and evoking a tiny giggle on Natasha's behalf. To hear the assassin laugh in such a carefree and girly manner struck Loki. Curious, he tickled her neck again, forcing her shoulders to scrunch up.

"Loki!" Natasha muttered, fighting the need to laugh. His fingers continued the motion, giving her stomach butterflies. "Loki, stop it!" she warned with a chuckle.

"You should hear how adorable you sound!" the god purred. He set his book aside and began tickling her stomach. "What other places will make the stoic spy laugh?" he smirked.

Natasha tossed her book aside as she attempted to break free of Loki's hold. "S-stop!" she ordered, unable to fight back a giggle. "Loki!" Natasha was weak to the constant motion of his gentle fingertips against her sensitive skin. She couldn't keep herself from laughing as his hand reached up her shirt to grab her breast. "Perv!" she snorted as he intentionally groped her. "Let's see if gods are ticklish!" she challenged. Natasha leaned towards his chest and let her own fingers softly tickle his middle. She watched his eyes squint and within seconds, Loki was unable to contain his laughter. "Not so scary now, are you?" she teased, making her motions even rougher.

"N-Na-!" Loki was smiling from ear to ear and laughing like a child. He fell back into the couch cushions, unable to fight back against Natasha's tickle threat.

"You want me to stop?" she laughed. "Just tell me when, Loki."

"S-Sto-!" More laughter.

Natasha was thrilled to see him in such a giddy state. Finally, she found the tough guy's weakness. "Okay," she decided, slowing down her fingers. "Get back to reading." She finished her tickle attack off with a jab to Loki's belly and the god's laughter was cut short by a high-pitched squeak. Natasha paused as she wondered where the sound came from. Surely it wasn't Loki-there was no way… She stared over at him and noticed his face grow bright red as he scowled and grabbed his book. "Loki?" she quietly asked. He responded by burying his face in his book, pretending to read a page towards the end. It was him. The shame was written all over his face. Natasha proceeded to poke his middle a second time, but he slapped her hand away with a growl. "You sounded like a cat or something!" Natasha's comment was followed by a burst of laughter. "What the hell was that?!"

"You exaggerate!" he sourly muttered. Unfortunately, Natasha couldn't hear him, for she had fallen onto her side, overcome by a rare once-in-a-lifetime fit of laughter.