"It's okay, we'll get through this, we can help her together," said Fey, completely oblivious to what the lamia was going through. She put her arm around the blushing Rina in comradery which only made the lamia blush all the harder.
Rina shifted her hips uncomfortably but decided that the sooner she was done the sooner this shameful experience could be done with and forgotten. She shifted her coils and pulled the dogkin forward and then reluctantly slammed her back. The dogkin screamed as she was pistoned down onto Fey's dick, the cock head slamming into the entrance of her womb and then after a momentary pause, as it squeezed against the head, she slipped over the edge and Fey's cock entered deep into her deepest sacred place. This of course turned the dogkin into a screaming thrashing squirting mess, howling into Rani's scales as her legs kicked up at Fey. The dogkin was truly trapped between the unstoppable force of the lamia and the immovable object that was Fey's cock.
Fey bit her lip as she felt herself penetrate deep inside of the dogkin. But she knew this had to be done, she was a healer and she could not bear to see the poor girl suffering. She quietly chose to ignore how good it felt to have the lamia's scaled textured body around her cock pressing through the dogkin's body.
"You need to go faster, she's not going to be sated if you don't give it your all," murmured Fey to the lamia beside her.
Rina looked at the ground, avoiding Fey's eyes. The trouble wasn't that, it was that she was starting to get turned on herself by all this, this- she didn't know what to call it, this medically induced sex where she was the nurse administering it!
She tensed her tail. Fine. If it was going to be like this then she intended to do a good job of it, to hell with it.
She coiled her tail tighter around the dogkin, squeezing the dogkin's insides around the shaft and causing the dogkin girl to squeak, and then she roughly dragged her forward until with a soft pop Fey's head dragged free from her cervix only for Rina to leverage her thick tail and piston drive the girl back the other way as hard as she could.
The dogkin's jaw fell and she full throatedly screamed as she went plunging down the massive length, her walls rippling past all the bumps and veins of Fey's vascular size in a storm of tweaked nerve clusters that sent electricity on a bombing run of pleasure up her spine and straight into her mind, activating pleasures that she had never imagined possible.
Her tummy bulge surged outward, thrusting between the scales of the lamia further and further until her pale skin was pushing up between her breasts. It only ended when the dogkin's muff crashed up against Fey's medial ring.
Rina's mouth fell open in disbelief, how was the dogkin stretching so much?! This was insane! Yet she couldn't stop herself from tensing her coils and dragging the dogkin back, leaving a shaft steaming wet with her the dogkin's juices behind. Strangely fascinated and increasingly turned on by the display, or rather what she was feeling, she more and more enthusiastically dragged and shoved the dogkin up and down Fey's shaft leaving Zal wailing and creaming and soaking her scales with her fluids.
She snuck a glance as she did this and saw that Fey was reacting quite strongly to her ministrations, the centaur's breath coming in huffs, her eyes half lidded and her lips slightly parted. A moan slipped from the centaur's lips and Rina's brows rose. That was her having that effect on the centaur? She was doing that to her?
Her arms around the centaur's upper half held on a little more tightly and the coiling pistoning motion underneath Fey's barrel redoubled, sending the dogkin up and down without end, her curly blonde hair becoming a mess that fluttered over Rina's pink scales even as Zal clutched at her all the harder, her fingernails dragging lines across her coils.
She was doing this! She was doing this to them! Genuinely excited now she slammed the dogkin down as hard as her tail could manage and the screams of the dogkin reached a new greater peak as her swollen puffy pussy slammed down on the medial ring and then with a wet schplup! Slipped over the top engulfing it with her folds and causing her tummy bulge to thrust up between her breasts, parting them as she was driven further and further down the shaft until her cunt slammed up hard against the base.