Anal Slime Fanfic (18+)

Rimuru was glad about one very important thing: the ability to control the shape of his member.

He thought maybe he could only make it bigger or smaller.

However, as he experimented along with the Great sage, something became evident.

He could in fact grow new stuff. Anything…

He wanted to try some of that stuff he'd seen in erotic mangas but for the time being settled with a double member. One grew on top of the other, nearly originating from the same place. His balls swelled a tad but he didn't grow more. Very similar to what he'd used even just moments ago, but something about the dual penis, something about it was a tad different. Shuna could understand. Both at the same time.

"C-can I go first?" Shuna mumbled, unable to keep her drools and pants in check. She'd climaxed a couple of times but it had only left her craving her. Her vagina twitched in anticipation as did her anus which wasn't totally wrinkly anymore- definitely expecting fun times.

Actually, she didn't even wait for a reply and just dropped on the floor with her butt raised. She even made the display of parting her lips, just for him.

But Rimuru wasn't interested in that position anymore. Instead, he liquified his fingers, forming a tentacle of sorts and wrapped it around Shuna's arms like ropes, lifting her up. Instead of entering her, he licked her and used more of his tentacled fingers to softly touch her on the nape, underarms, ears, belly button and tail bone. He did not touch her in any place too sensitive.

"Ri-Rimuru-" Shuna managed but Rimuru was of course not listening. There was a bit of hollow yet animalistic glint in his eyes, something that wasn't there before.

"Lord Rimuru," Shion mumbled, almost rubbing her nether against Rimuru's hips. But before she got too close, Rimuru picked her up too and raised her just like Shuna but instead of teasing her, he started inserting those tentacles deep in her holes; they slipped right in. Buzz! And vibrated. "AHH!!" Shion cried out loud at the intensity and then started moaning loud over and over again, as liquid pleasure built in her abdomen and forced its way out, leaving her twitching for more.

Meanwhile, Rimuru kept staring at the squealing-pleading girl before him, at Shuna. He reached forward, pressed his lips on hers and inserted his tongue inside her mouth, wrapping it around hers. Shuna mumbled, moaned, yet welcomed him. She welcomed him with all her being, taking in his taste, his scent, his love… just what she wanted. Exactly what she wanted.

His twin cock pressed against her vagina… wait, just vagina? One of the cock entered her from the front but the wiggled her back passage. Phew-

But she couldn't relax just yet. She moaned and relaxed her ass but she just- she just couldn't stop the tinkle, the pleasure from building up. If it's like this- she'd cum sooner than later and he'd probably move on to Shion. No, she didn't want that. She wanted him all for herself. She wanted him right now and forever!

"Fu-fuck me more," she mumbled. She couldn't move, she couldn't hug him, and yet the binds only intensified the feelings. It only made her feel barer, and more loved.

And Rimuru obliged. He pumped her but just when Shuna thought it couldn't get any better… her insides shook.

Buzz!

Zzz!

"AHHH!!!" She screamed with the sudden burst of good feeling. What is this? Like an electric shock, it was melting her from within.

Did she even have anything down there other than just pleasure?

What eve- her thoughts went blank as her eyes rolled and a burst of cum blitzed out of her in a neverending fury.

An explosion of fun!

.

..

…

Spent, she was.

Rimuru let her go and moved his attention elsewhere, to the other girl who was also…. Spent?

His stared quizzically for a couple of seconds before coming to his senses.

Well, fuck… he gulped but since both of them were still fine (probably) be breathed a sigh of relief and jerked himself off to finish the event.