Heads-up. The name for the tentacle monster is made up. Please do not tag Badumsquish's art with the name.

"This is him." Twilight Velvet blushed at her husband. "I call him Mr. Swell." She smiled at the five pony-lengths of tentacle-worm that waved a pointed end at her and her husband.

"When you said," Night Light began, "that you wanted to spice things up, and introduce me to 'somepony' who you would like to join in, I thought you meant a mare or stallion." He took a deep breath. "Not that I mean anything bad by that, Mr. Swell. But you have to understand, this is a little bit of a surprise."

"You know it was my turn, Nighty. He said he would play nice with both of us." Twilight Velvet held out a hoof to the tentacle creature, one end of it twirling around her hoof playfully.

"It is, but Mr. Swell, do you like stallions? I mean, the love of tentacles for mares is… legendary, but—" Night Light was jerked off his hooves and pulled to his back as the rest of the tentacle wrapped around him. As the tip rubbed up and against the opening of his sheath, he gave an appreciative groan.

"That's a yes, dear." Twilight lifted her hoof up and toward her, kissing the tip of the tentacle. It slid against her lips and within them, pressing into her mouth and swelling out inside. Gasping and groaning, Twilight's eyes fluttered closed.

Night watched his wife orally pleasure the end of the tentacle, her cheeks puffing out with the mass of it inside her. "How about you… you… right there… that is good…" His eyes crossed; Night Light was pushing out of his sheath and into the grip of the tentacle, and as it squeezed and encouraged him to full hardness, it squirmed at his urethra.

Twilight felt the tentacle pull from her lips just as she was tilted into the air at just the right angle that she could kiss her husband. "Love y—" She didn't care that her words were cut off, but her eyes locked onto a prize. Lighting her horn, she wrapped Night's balls in her magic, and as the tentacle stroked and rubbed him, she massaged his orbs.

Unable to do anything but stare up as his wife became impaled on the tentacle, Night watched as more of the thing squirmed into her vulva. The touch of the tentacle on his shaft changed, but then he felt the second end of Mr. Swell nuzzled up to his anus. He closed his eyes in bliss, groaning into Twilight's mouth as his rear was claimed. Squirming inside him, Night didn't have long to wait for the tentacle to start pumping.

"Mmfmfm…" Twilight groaned against her husband's lips, she suddenly felt full, the tentacle swelling up and locking inside her, while pumping her body with its seed. Her eyes fluttering, Twilight Velvet looked at Night's shaft, just in time for it to erupt. Her own body suddenly trembled, the stuffing by the tentacle combining with the painting by her husband, to send her over the edge and into an orgasm.

The two ponies struggled and bucked, groaned and moaned as they were treated to grand pleasure by Mr. Swell. With time, all three retired to Canterlot. Time passed, Twilight had some bad days, and all too soon the reason was known.

Twilight was relaxed, laying on her back in her and Night's sun-room. Her belly was starting to show, slightly puffy, but she knew it wasn't her husband's foal this time. "Mr. Swell, you are a very naughty tentacle." The pressure in her bowels grew as the tentacle unloaded more. "But every time Nighty tried to screw me, you took me instead. Anypony would think you deliberately knocked me up." She trembled in bliss as she felt the thick shape in her rear squirm.

Author's Note

To find, head to derpibooru and use the number 1347057 after the url.

Support me on Patreon or fuel my writing on Ko-Fi!

Join me on Discord. Warning, said chat may contain NSFW material and should be considered adult in nature.

Awesome ponies who are already helping to keep me in keyboards and rum:
Canary in the Coal Mine
Daremo
Mary Rowland
Boulder
A.P.O.N.I.
Mephia
Nils
Ian

And special thanks to the following, for careful eyes and friendly words:
Daremo
Vutava
Boulder
Jeffh4