very close encounter

With a voice like loudest roaring thunder had been contained in the faintest whisper, it spoke, rattling the room. "What is thy bidding, Concubine of Yeziroth?" I looked down at its now massively erect, throbbing rod, then at the jagged chunk of metal. I felt my juices running down my thighs as it sniffed the air. Its tails swayed restlessly as I stared into its eyes. "What would you command of me?" it asked, stepping closer.
I knew I should have commanded it to stop, knew I should have drew the Banishing sigil; but against all my better judgement, I just bit my lip and felt my knees open slightly.

Its tails swayed forward, gently caressing my calves. It was slowly insinuating itself toward me. I could feel the heat from its massive rod as it angled toward me. The tails worked themselves up to my thighs, up under my skirt, wrapping my legs in their powerful coils. I fell back onto my forearms, my breasts jutting upward toward it. The tails started to pull my legs apart. My breath started to catch. If I couldn't think of anything soon, I'd be done for until Mike got back. I felt its charms working in my mind, images of pounding exctasy as I writhed on its hammering prick.

The tip of one of the tails slid between my thighs, its thick bulge pressing against my soaking wet pussy lips; coating it my juices. I gasped, my eyes flaring with lust. "I...I...command...." I said as the tail pressed and rubbed against my smooth sex.

"Yes...?" is asked again, pressing my knees apart with its immensely powerful hands. Its thick, oozing cock touched my inner thigh as it started to hover over me. I was flat on the desk, chest heaving. "What is thy command, Mistress?" he asked again in his rumbling voice.

"...I...want...you..." I said, feeling his massive dick slide beside the tail. My mind went blank as I felt the first orgasm already building. "I want you to..." I mumbled, my hands pressed against the desk. The tails had slid up my body, under my shirt. Their barbed ends teased my nipples to painful erectness as I unconsciously began to buck my hips against his cock. My left hand touched the book and I exhaled as I felt his cock slide down, pressing firmly, slowly against my hole.

The door buzzed, and it sounded like a firestorm. My eyes shot open and staired at the demon on top of me. "I want you to stop!" It grinned, and drew back slightly. I was puzzled for a second, and then it said...