Late at night, the otter was tapping away at his keyboard, the otter slowly working on some project, the screen flickering against his grey fur, and swapping between tabs. He paused, the keyboard falling silent as he felt his boyfriend's arm wrap around him from behind, a small open vial held in the coyote's paws.

The scent coming from the vial was alluring, causing the otter to breath it in deeply. He began to feel a bit warm, then flushed, and a bit dizzy - and a tense feeling in his crotch as his arousal started to peak. "Hu... what's... happening?" he asked in confusion. In response, his boyfriend pulled him off the computer chair and onto their bed, the coyote's paws leaving a tingling sensation wherever they touched his fur.

The coyote pulled off the otter's shirt and began to rub his chest and nipples, which began to grow stiff. The otter begins to moan as his once flat chest begins to grow under the coyote's kneading paws, breasts first forming a-cups, then the weight and pressure increasing as they swell to d-cups. The otter's once masculine voice begins to pitch higher, the electric sensation in his growing bossom causing tingles of pleasure.

Moving his paws from the otter's breasts to the rump, the coyote begins to rub, murring as he feels the otter's hips spreading and butt swelling. The otter moans a little in a bit of squirming discomfort as he feels his innards shift inside and his waist feels constricted as it narrows. 

The coyote begins to knead the otter's cock and balls, and the otter's arousal rises while having a strange feeling of shrinkage as his balls dwindle away, and the skin of his sack shrinks back into his crotch and then back inside his pelvis. Moaning loudly in a high pitched voice, the otter's penis gets smaller while still stiffining, and the first flushes of feminine need wash over the otter as her changes complete. A needy heat rises from her new crotch to fill her whole body, washing over her mind and drowning rational thought.

The coyote growls lowly, sending shivers down the otter's spine as she mewls needily, spreading her legs for her lover as the coyote sniffs around her belly, before lowering to her warm slit. Her boyfriend's cold nose makes her gasp, then she begins to moan loudly as he licks, the heat from her innards growing with a greater intensity as her lover stimulates her new sex.

The coyote pulls away, and she cries out for lack of stimulation for her nethers before the coyote starts grinding his already swollen member against her slit, the otters needy mewls egging him on, rational thought lost and her mind beyond words, but still begging for him.

He growls again, sending another submissive shiver down the otter's spine again as he teases her entrance with his tip for a moment before plunging in, a sharp pleasured yelp coming from the otter as her coyote lover fills her completely, and another yelp as he pulls out and jams in again, starting the process of pistoning in and out of his mate.

She wraps her legs around the coyote's waist in an attempt to drive him farther in, the otter desperately needing to be filled, and she begins to feel something large jamming against her entrance, the coyote's knot trying to get in. With a loud growl from the coyote and a wet pop, it slides in, eliciting a louder yowl of pleasure from the otter, giving out short moans as the coyote switches to short, quick strokes.

The coyote moans, then gives a final deep thrust as he howls, his balls balls emptying his virile seed into his otter's fertile womb, sending the otter into her first female orgasm, moaning loudly as the muscles in her nethers quiver, milking her lover's cock for all it's seed before passing out asleep.

With a final weak thrust, the coyote pants, and lays down onto his otter lover while still tied in her slit, finding himself blacking out asleep as well.