"Mongoru g.327 is pleased with subject 7a." The voice rasped.
The thing braced itself, resting just below his hips, wetness oozed from it, as it slid up along his cock, slowly engulfing the head. It tightened, a soft wet ring, around his glans. Wetness dripped down his shaft. The humming intensified, and the thing, what felt like a warm, wet tube, rolled itself down his shaft.
Llygl clenched his teeth.
"Subject responds slightly to stimulus."
The humming became a purr. The sucking intensified slightly, as the thing rolled up and down his cock, stroking his shaft. It tightened around his cock, stroking faster and faster, oozing wetness. It sped up, then slowed down, but didn't cease. Finally, Llygl's balls clenched, but suddenly, it stopped. He let out a soft groan. There was a raspy chuckle.
"Subject has discovered the Mongoru's feature, and is disappointed at his inability to climax."
Llygl gritted his teeth. The thing paused only a moment longer before starting up again. It slid, tight and wet, up and down his shaft, rolling itself along it. It grew faster, than slower, and suddenly, as it rolled itself fully over his shaft, a wet, tongue-like thing sliding over his cock head. It pointed, and licked around the ridge separating head from shaft. The rolling began again, tight and wet, up and down his shaft. It grew faster, and faster, stroking him until his hips thrust forward, and his balls clenched again. Once more, it stopped, just as a few drops of come escaped. He let out a frustrated moan.
"Subject appears to be enjoying the Mongoru's attentions."
His heart rate began to slow down as the thing began its rolling again. It sucked and rolled, from tip to balls, again and again. As it began to speed up, it didn't take as long for Llygl's hips to begin thrusting into the thing. The purring became louder, almost a moan. It rolled up and down him, fast and hard ... yet still soft, somehow, and tight around him. His balls clenched, and the thing sucked him as he came, hard.
"KIRA!" He gasped, his fists clenched, the thing throbbed as it sucked his come inside it. Llygl panted, sweat glistening on his forehead and chest.
"Very interesting," The dry voice mused. The thing was removed, and as it was placed back into its jar, it moaned softly, almost happily.