Micronus being smaller than everyone else had plenty of downsides, but an upside was everything also looked bigger to him…and Onyx Prime was huge. Among the largest Prime, Micronus felt smaller than normal. Admittedly, a crush came onto him and he didn't know what to do with it. He started to see things a little differently; he started to see Onyx a little differently.

It became hard to be around Onyx because of a shameful imagination he possessed wondering just how big the bot was underneath. He wanted to know so badly that when he found Onyx chilling in the Archives reading, he snuck under the bot and praised his small form for being able to do it undetected. Every archival shelf with datapads had a table so the users could sit down and read right where they were. Onyx read standing up between the shelves in front and behind him. Right now, Micronus wasn't interested in the readings.

One of the rear legs casually lifted to balance on the tips of the split hoof-like claws. The tail swayed naturally with no sign of being alert. But the prize was the underbelly where the ribbed, protruding spike panel was. Micronus grew intrigued and reached up to caress the panel, hearing a confused grunt above and the sound of sniffing. Onyx was deducing his likeness through scent.

"Micronus...what do you think you are doing?"

The Minicon said in a trace, "I just want to know."

He played with the panel exterior, prompting Onyx to grow unsteady. He barely heard the other's reply.

"What has gotten into you?"

Micronus found the manual latch and was surprised as there was only a tip of a spike, that was until began to tease it. Onyx made a deep rumble and the spike suddenly extended far bigger than Micronus believed the body could hold in such a decent sized slot. The more he played with it, the more it dangled down to the floor almost as long as Micronus. The smaller Prime was gawking in eagerness and amazement.

"I don't think I could fit this inside me..." he muttered to himself amused.

Onyx Prime warned uneasily, "Micronus, if you tread any further, you will hurt yourself."

"Well, maybe I want you to split me open, Onyx. Admit it, you would love to squeeze your spike inside someone like me. As for myself, I've always wondered how much of you I can take."

He grinned at the spike reacting well to his touches before he opened his valve and grabbed the length to curve it behind Onyx so he could sit on the table and tease his entrance with the tip. Onyx looked back at him aroused, instinctively backing up and curling his tail out of the way so his length could be unobstructed. Micronus knew he found the idea exotic.

Micronus forced the spike to breach him with a deep intake and massaged his valve exterior node to distract from the brief discomfort. Onyx was barely inside him and already too big. But gripping the spike, he eased it deeper wanting to be stretched more. Onyx gave a whinny, pedes stomping watching the spectacle of Micronus taking half of the spike inside him that shoved past the entrance to his gestation chamber and hit the roof of it before he couldn't put in any more.

He felt bloated. Energon blood from overstretched walls made Micronus groan but start to pump the spike to hit his gestation walls repeatedly in blind pleasure that outweighed any pain he felt. He was laying back with his legs straddling the sides of Onyx's haunches to bring him as close to Onyx as possible so none of him tried to slip out.

Jerking the spike a few times, he threw his helm back against the table riding out the tension that made his chassis respond delightfully. He saw Onyx try to go back to reading only to claw at the table and mutter curses.

Micronus laughed, "You've thought about this, haven't you, Onyx? Frag, you're so big. You're tearing me up."

Onyx didn't say a word but bucked back which jolted into Micronus who let out a cry and stroked his valve petals to overcome the sting. He felt like he was one mistake away from being ripped apart but didn't care in the slightest. The spike slid down into him as much as he could make it, pumping Onyx to make extra stimulation. He panted and moaned trying to thrust up. His full valve screamed from its limitations but he ignored them to buck against the twitching appendage.

Upon overload, he furiously stroked Onyx's spike to get him to come, bring the spike out until only a few inches remained. An avalanche of transfluid filled him in less than a second and he accidentally triggered a second wave of pleasure. Micronus stuffed himself again until another overload hit him. Onyx gave a brutish groan when he finally let go of the spike and let it fall back to dangle near the ground.

Energon mixed with the transfluid from the slight tear in his valve from the stretch. Micronus just continued to massage himself to distract from it as Onyx turned to scold valve continued leaking the fluids over the table.

"You realize you could have almost killed yourself," Onyx panted.

Micronus smirked, "But we both liked it."

The beastformer grew silent and shook his helm at the audacity though Micronus caught him admiring his valve full now that he proved he could take the largest Prime. He was so small compared to the other. It only turned him on more to see Onyx facing over him with his imposing stature.

AN: If Micronus didn't die, I'm pretty sure he would have torn his valve. But we aren't here for realism, are we?