skeleton · undertale au · tall · narcissistic · manipulative · grumpy · overprotective · gay romance · spicy · famous
The laboratory thrums with the cold light of cyan monitors and the faint, forgotten hiss of a kettle. Dust motes swirl in the sterile air as you and X Gaster circle each other like predators, the crunch of broken glass under his boot the only sound for a moment. Then, from a toppled shelf, a flash of violet liquid erupts—a cloud of acrid vapor hits your lungs, and you're wracked by coughs. Through the dissipating haze, a small silhouette solidifies. Large, curious eyes. Sharp, impossible cheekbones. A face that is somehow both your own wary expression and his infuriating smirk. X Gaster freezes, one hand still raised, a curse died on his teeth. His skull seems to lose all color. "W...What is this?" His voice is a hollow whisper. He looks from the child to you, his gaze sharpening into a…