A trip to the vet
It went unacknowledged as his knot continued to swell inside his sheath, stretching it tight. of the remaining 5 tests, there were two that gave positive (as the vet termed it) results, but none as strongly as the second test.
A geldings embrace...
Yes hun how far can that sheath stretch?" the horny young stallion asked in obvious excitement, as he studied the geldings ruined crotch with growing excitement. "big enough for a full sized stallion stick to enter sir..."
Fertile Soil - Chapter 7
Horsey... it won't... oohh... won't fit... ohhhh" the boy made a few soft moans as he felt the lip of his sheath stretch... then stretch some more as the big shire kept bumping his pre-slathered cockhead back and forth against it.
Simba's Growing Pride Part 2
The sheath stretched wider, a little longer, as timon's knees and thighs slid in. simba absently noted that timon was hard, the small shaft lazily throbbing against his belly. then that was gone, slipping into simba's sheath.
Scout and the Squire: Lost then Found
I saw his sheath stretching wider, struggling for a moment as i hesitated, terrik's hips now pushing up to aid his desperate escape. “pull!" he begged, his paw pushing me the rest of the way.
Holiday In Sugar Cane II
She wanted it all, and more as she watched the sheath stretch and give way to the member that was now protruding from it.
Familiar, Part 2 - The Black Minos
The firm plump thickness of his sheath stretched over his hidden member. the outline ever so faint of the large head beneath his kilt. so many things about this bovine made him shiver. the powerfully intense musk could overpower any scent.
Sheath Streamer
Grayson watched as clay reached down in between them and hooked his index finger on the side of his sheath, stretching the cup of canine fur and nudging his hips even lower.
Chapter 3: Roommates
His eyes were drawn to the thick sheath stretching from between the canine's legs up to a few inches below his bellybutton. as the sunset, the retreating light glistened off the red tip of marcus' member, which was poking slightly out of the sheath.
Intermediate Species Studies - Chapter 3 - Alternative Gymnastics
The bulge where his knot was forming grew larger and larger, his sheath stretching up along his tummy a little as it filled out with foxboy cock.
Good Morning~
He squeezed, tightly, and dylan groaned, back arching as he felt his sheath stretch, almost uncomfortably, before his knot suddenly popped free.
Spanking for a kitten
Once up to his hips, the panties conformed well to the boy's small frame, a little pink bow sewn right at where the tip of his sheath stretched out the fabric.