Naturaly

Brent gulped. "Y-you mean, here?" He hadn’t done anything like this since
Uni, and certainly nothing like jerking off with a complete stranger in
a public sauna.

 Karl chuckled, "Sure, why not? You look like you’re in the mood." The 

equine slid his other hand beneath his massive organ, taking his sizeable
ballsac into his grip, squeezing the orbs, tugging on them a bit.

 The equine’s body had begin to take on a sheen from his sweat, the heat 

of the sauna, and perhaps the heat of the moment, making his body glisten
and shine. That, combined with the way the stallion tugged as his balls and
worked his hand over his now slickened, glistening cock, was perhaps, Brent
thought to himself, the sexiest thing he’d seen outside of his wife. Brent
closed his eyes for just a moment, centering himself. He opened them again,
and reached his paw between his legs, wrapping it around his erection,
stroking the skin of his sheath up and over the top, then down, exposing his
pink length, beginning a rhythm. He smiled, letting himself go, and more
comfortable now that he wasn’t clinging so much to his nervousness. "Yeah,
yeah I think I’d like that."

 Karl grinned approvingly. His grip on his shaft tightened, and he began 

to stroke himself, less in a teasing, massaging way, and more insistently.
His cock curved slightly upward, the equine pulling it back a bit, rubbing
the oozing tip against the top of his belly, Brent’s eyes watching hungrily
now, gazing at the ridged underside of the stallion's organ.

 Brent’s own paw moved over his shaft, in a faster rhythm than the 

horse’s, his white-furred ballsac bouncing a bit with the wolf’s movements.
The heat and moisture of the sauna had made both bodies damp, sweaty, beads
now running down the equine’s body, and matting the wolf’s fur. Karl’s
masculine scent hung strongly in the air, something Brent had never really
smelled before, even with his college buddy. He found it intensely arousing,
pulling the skin of his sheath up over his cockhead, drawing a deep breath
and sighing at the wonderful feeling. Caught up in the moment, without even
thinking, he blurted out, "C-can I taste it?"