Magick Harvest Chapter 3: Centaur's Breeding Post (Patreon Post)
Ryker leaned against the enclosure, watching as his centaur forced himself into another erection - a floppier one than before, but nonetheless an erection - and started forcing it into the breeding tube.
The Life of Windsire, Chapter 6: A Spirited Debate
The demon was in full control this time, and he couldn't stop himself from humping away, thrusting his cock between his fists, using them like some sort of breeding tube.
The Breeding Man 1
The squelching feeling of the breeding tube kept him from going soft, the perfectly adjusted warmth inside mimicking the feeling of cow cunt perfectly, reminding his biology what it was supposed to do, supposed to want.
Pleasurable Instincts
A few minor modifications for greater capacity in the breeding tube may be required as well for added durability... " she finished, reaching over and flicking off the cameras mounted around the barn.
The Happy Sacrifice
A breeding tube. _can't leave..._ she could never leave, not until the clan returned to give her help in five years.
Draconicon's R34 Harem 11: Bringing Out The Beast
Beast thrust forward with all the eagerness of a stud led to the breeding tube, humping into the dragon's hand before thrusting his ass back against the cock inside of him.
Ray and Perseus
As the male made himself comfortable on the stallion's lap, perseus grew his breeding tube inch by inch between the butt cheeks of his beloved wolf, countless pairs of eyes peered through the gaps in the wooden beams on the walls, bidding for both of them.