Mary was freaking out. Physically, she felt relaxed and sated after the insanely erotic, literally-animalistic sex with Xander, but her mind was screaming at her. Her "boyfriend" visibly resembled a werewolf, they were stuck together at the groin, he quite possibly had the complete mind of a wild wolf (thankfully tired from the aforementioned crazy-animal-sex), and she seemed to be retaining all her human faculties while her body slowly became that of an arctic wolf!
While she didn't relish the destruction she was sure two wolves would wreak on their home before their return to human form, she found herself wishing for the animal-oblivion she suspected Xander was experiencing.
Gazing down at her body again, she estimated they were at about the mid-point in their changes. Xander's feet resembled paws, but his legs and thighs were still muscularly human. Grey fur coated his body, but she couldn't see a full tail behind his rump yet. Hers, she could feel, awkwardly squished beneath them both, fur tugging somewhat painfully between their hips and the couch fabric. Shifting her hips again, she tested the knot, hoping it had lessened and she would be able to get up and possibly escape to the bathroom.
No such luck. Xander's claws flexed on her hips, holding her in place, and she again met his golden-gaze. He shifted, easily bringing them into a sitting position with her bottom resting on his groin, his muzzle tracing the underside of her jaw through her thick neck-fur. His hands skimmed up her torso, and Mary could feel rough paw-pads on his palm, ruffling her new white pelt as they traced up her ribs to cup her furred breasts.
"Well," she thought to herself. "I'll take that as a sign that he isn't 'all-wolf' yet." Xander had always been a boob-guy, and Mary couldn't recall ever hearing about feral wolves caressing their mates' mammary glands. As his roughened fingertips grazed over her nipples, she mistook the tingling/tightening feeling for arousal, unaware that her human breasts were slowly shrinking as her ribcage reshaped and her shoulders flattened. She whimpered when she felt Xander lower his hands, but was pleasurably shocked when she felt him tracing over two new areolas, tugging the nipples to firm peaks before slipping still lower to another set of sensitive buds. Mary leaned back against her mate, closing her eyes and enjoying the feeling of being pleasured by him.
While one paw-hand teased a lower nipple, Xander's other dipped down to Mary's opening, feeling her lips still stretched around his embedded member. He gently flicked the bud he found there, a rumbling growl echoing her soft "aahhoooo" of ecstasy. Mary began to thrash her head back and forth on his shoulder, gripped in the feelings Xander was eliciting from her unrecognizable body. Her muzzle pushed forward as her pleasure increased, reaching it's full wolfish potential even as her ears lengthened and shifted upwards.
Her mate's strong arms again encircled her, moving them until she rested face-down on the couch again, this time with her upper body pressed into the seat cushions. Mary could feel Xander's cock swelling again, the juices of her pleasure lubricating his renewed movement as he began to pump into her once more. She wriggled a bit under him, slightly sore from their previous session, but Xander's response was swift and brutal: Mary suddenly felt sharp teeth and hot breath on the fur at the back of her neck, and she knew that Xander's wolfish instincts were telling him to hold her in place until he finished. She stilled, whimpering at the combination of pain and pleasure.