"That'd be weirder than if you shoved me against the wall and made me your slave." An offhand comment made by Zim, who now lazily sucked the last of his Irken soda. Something in GIR's head seemed to snap. He had asked what would happen if the big head boy had asked for a… truck? Force? Truce… That's the word.
Cyan eyes glowed red and a smirk formed on metal lips. Zim gasped in shock, slight pain, and an odd pleasure as his back (or rather, his PAK) hit the wall roughly. "G-GIR, what are you-"He was cut off when the robot smashed their lips together, making Zim gasp again. GIR took the opportunity to shove his tongue in his master's mouth and explore the wet cavern. The top of GIR's head opened and several tentacles slowly crawled out. One tentacle pulled down Zim's pants and another rubbed lightly against his inner thigh. The alien practically melted, whimpering quietly in pleasure and bucking his hips when a large tentacle rubbed against his dripping slit.
GIR smirked and leaned in, taking an antenna into his mouth and sucking gently before whispering, "Say my name. In this moment, who owns you?" Zim shivered in arousal, a purple blush staining his features.
"Y-You do… GIR…" the alien whispered embarrassedly. Another tentacle rubbed against his lips.
"And since I own you, what do you think you should call me?" GIR licked the stalk slowly, eliciting a moan. Zim blushed harder, humiliated that he, a strong Irken invader, gave in so easily to his own robot slave.
"Master," he breathed. He was rewarded with a large tentacle in his mouth and another in his slit, which hit his pleasure spot perfectly in one hard, quick thrust, making him moan loudly.
"Good boy." The tentacles thrusted slowly at first, quickly gaining speed and strength. Zim was losing himself in a white-hot pleasure he'd never felt before, nearly screaming, however muffled the screams were. GIR pulled away the tentacle when Zim tried to speak. "What was that?" Zim could hardly speak through pants and moans.
"I-I'm… I don't kn-know!" The robot nodded, understanding what his master meant. The alien's vision flashed as an unbearable pleasure overcame him. "MASTER!" Some tentacles held up Zim's limp body as he panted harshly, attempting to catch his breath and return to reality. They laid the spent extraterrestrial on the couch, and then returned to GIR's head, and no sooner did they return that red eyes faded to cyan once again.
"Master? Did you play without me?" he whined. Zim chuckled breathlessly and shook his head.
"No, GIR. You played, too."