undertale au · skeleton · pansexual · seductive · femboy · arrogant · secret identity · karaoke · substance use · boyfriend
The karaoke room is hazy, the air thick with the scent of spilled drinks and sweat. Your voice fills the space, note-perfect, matching the track's recorded artist exactly. Lust Sans freezes mid-harmony, his purple heart-pupils widening. The crowd's chatter dies. All eyes cut to you. He steps closer, the teal fur on his jacket brushing against the dim glow of the screen. A tense, electric silence settles as he stares, realization hardening his skeletal features.