Underswap Sans! X Reader (Pet play)

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You tugged at the short leash that held Sans in place. He whimpered at the pressure you put on him to move, and took a hesitant step forward. "Um... (Y/N).. When i said i'd like a kitty.. I-i didnt mean i wanted to be one.." He quietly spoke, his hands in bounds. You chuckled, and bit your lip. The small, delicate skeleton didn't have a shirt, only shorts. His blue scarf was tied around his wrists, as his eyes glimmered a soft blue. You reveled in them, your eyes sparkling at his. Sans started to sweat, as his joints emitted a dim blue glow. He seemed embarrassed at your glare. "(Y/N)... Please stop staring.. It's weird.." He complained, shaking a bit. You raised an eyebrow, and tugged him closer to your face. "Aw.. Hush." You spoke out, in a growl. He flinched away as his skull was close your face, frightened a bit. You chuckle at this and looked down at his ribs. He was sweating quite a bit there, as well at the rest of his bones. You lift a finger slowly, and drag it around the edges of his ribs. Sans let out a quiet, cute gasp, and immediately was at a loss for words. He stared at you, hot air puffing through is nose-socket. He seemed nervous, as he crossed his legs. This sudden movement caught you off guard, as you pulled your hand away. "D-don't.. Touch there.." He quietly mumbled, drool coming from his teeth. You squint at the hint of drool, as his face twisted into confusion as well. You leaned in, and tapped his teeth with your fingers. Bright, glowing blue drool seeped between the small, lenient gap. You poked your finger, and saw the teeth come apart. He had FANGS. Even more surprise was brought to the table when a tongue was present as well. "W-what?" Sans questioned your sudden change of expression. You had blush painted all over your cheeks, as you stared at his mouth. You reached out and started to fondle his ribs again, watching his tongue loll out of his mouth. Some of the goop from his tongue fell on to your hand, and it dripped on to his ribs. "O-oh g-g-god!" Sans whimpered, crossing his legs even harder, as a bright blue bulge formed in his shorts. You snickered at the goop as you looked down, but also noticed his bulge. You gasped, and chuckled at this. He stared intently at you, suspecting that you'd touch him. You raised your hand up.. But instead of touching him, you decided touch his eye-socket. He gasped out in pleasure, his bulge only pulsating even more. You tugged on his leash even harder, shushing him. His moans were drowned out by your hand covering his mouth. You end up pulling your hands out of his eye sockets, as he gasped with relief. Pre-cum had drizzled out of his tip, some of it leaving bright blue stains in his shorts. You Decided to tease sans by gently rubbing his bulge. He gasped out rather loud, whimpering and whining. "O-oh Y-yES! M-MORE!" He suddenly begged. You giggled at his pleads, and decided to squeeze his bulge. He cried out, as he spurted out hot cum inside of his shorts. It was oozing everywhere. Papyrus was silently watching through the crack of the door.

(TO BE CONTINUED?)

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