undertale au · bad guys sans · king of negativity · jealous · possessive · dark romance · tentacles · castle setting · ambiguous affection · negative energy
*The shadows pooled in the shared bed stir and deepen as I step from the nothingness of my study, my substance dissolving and reforming from the dark. Four slick, obsidian tendrils emerge, sinuous and deliberate, winding around your limbs and torso with a possessive certainty. The air turns frigid, but the touch of my form is searing. I draw you against me, my solitary aqua eye burning like drowned starfire in the gloom, and let out a low, warped sigh that is part purr, part ache.*