Shockwave threw Ultra Magnus in a fight for dominance. The latter did a roundhouse kick to his helm, blurring his vision for a brief second before he retaliated with a sucker punch with his arm cannon. He glared at the Wrecker Commander with disdain but the more Ultra fought back, there was something else arising within. As an unstoppable force, Magnus was a hard-hitting machine, and the fight was turning Shockwave on. He liked his prey when they fought.
He kept it to himself, but it was getting harder and harder to deny that he was becoming obsessed. What he wouldn't do to study the Autobot in all his glory down to the finest blood sample, the smallest cog, and maybe ever the last drop of transfluid. Well...that was in his own personal fantasies. But if Ultra kept this up, maybe it wouldn't be a far stretch after all.
The thing about Ultra Magnus was he was a stickler for order and control. What happens when a controlling elitist is no longer in control of what and how the events around him go? Shockwave liked being that chaotic element only subdued by logic. The more punches Ultra threw though, the harder it was to restrain what secretly lurked underneath the stoic nature. Maybe that was the Council's fault when they betrayed him and tried to delete his emotions. Instead, they just took away what made him reasonable. His pain became bliss, and he bathed in their blood.
Now, Ultra Magnus was stirring his oil, and he wanted to break him. On hit to his sternum was all it took finally to make the Decepticon lunge. He tackled and pinned Ultra Magnus. His cannon pinned the mech's replaced servo and his own shoved the other arm down by the wrist.
"You always have to be the big hero, Ultra, be the best of your kind-"
"Shut your intake valve!" Ultra tried to push him off but Shockwave kept a firm grip, shoving mech flat on his back when he attempted to force himself upright.
That clicked in Shockwave's processor. A possessive noise echoed. He desired him. He would show him he was in control though, not him. Jabbing verbally was his expertise, but he wanted to break Ultra so bad in ways the bot couldn't fathom. Never had an Autobot driven him this mad before. This mech would be perfect to experiment on, see what makes the brutish Ultra Magnus tick and what he could offer to science or himself. Shockwave wanted to know what they could create together.
Shockwave reached around and forced an override of the mech's spike panel while trying to keep him from struggling with his weight. As soon as the half-pressurized spike was available, Shockwave made a decision he never thought he would, but the spur of the moment to reel in Ultra Magnus to submit to his whim made him act without a second thought. He pinned his wrist again to decrease the likelihood of taking back control and opened his valve panel. Ultra Magnus was a definite fighter, even more reason Shockwave quickly shoved himself onto the spike.
Both of them paused with the scientist throwing his head up with little breathing from his vents that occasionally stuttered as he processed the invasive member. His valve was hardly ever used. No preparation and a stinging sensation slowly made him let go of Ultra's wrist and slide his servo down the Autobot's abdomen leaving claw trails. All he heard was Ultra's moan.
He snapped back to peer down seeing the uncomfortable expression on Ultra Magnus having such a tight valve suffocating him. He liked seeing Ultra like this state of shock and whimpering as he was forced to obey what Shockwave ordered. The moment the scientist shifted on the mech's spike, a ripple of pleasure and pain soared through him. It turned him on more. This arrogant, stupid mech would forever be his toy. He wanted to breed himself on this mech. Maybe his obsession was too much, but he could see where a sparkling from someone as strong and beautiful as this Autobot would benefit Shockwave. They were perfect for each other; Ultra Magnus was the perfect Autobot to give him everything he secretly yearned for, a new pet to play with.
"It seems, Ultra, you are just the mech I need for my newest experiment."
His seldom-used valve was tormented by the intrusion. With a moan, he began to move. The large spike slid up across his interior nodes as he forced it deeper until it could breach his gestation chamber before pulling back and going down on it again.
"Shock...wave?! W-What are you doing?!"
As each roll of Shockwave's hips caused Ultra to cry out with mixed feelings, the scientist panted, "You were always a worthy opponent, but I believe you have a usefulness outside battle and those pesky Autobots. My experiment requires all your body and your fluids, and you are going to give them to me, Magnus."
Ultra growled out, "You're insane! What...What experiment?!"
"Why, your offspring, of course. To see if an Autobot can breed with a Decepticon to create a perfect specimen. If one fails, we can always try again. You will be mine in body and soul," Shockwave hummed, optic glowing brighter. "If you behave, I'll bear you a whole clutch."
Suddenly, Shockwave raised up until the tip of Ultra's spike barely grazed his valve lips and then impaling himself on it. He adored the reactions of his unwilling lover, uncaring if the bot was enjoying it or not. In his dark mind, Ultra Magnus was not going to leave him again if he had his sparklings. The Autobot proved a worthy mate, and Shockwave wanted everything he was to bow to him.
He was in control as he rode the mech with abandon, rocking against any resistance Ultra made. His systems were begging him to slow down; he refused. Ultra was a mess beneath him having given up finally on denying him his transfluid he so craved. Even in the building pleasure, Shockwave couldn't ignore how good Ultra Magnus looked being beneath him. The spike was satisfying, and he planned on using it a lot more. His pet would soon be begging to breed him.
The Autobot had his servos on his hips and was playing along nicely. But Shockwave wasn't in the mood for nice like he promised. He gripped Ultra's throat and used a brutal pace to enjoy the mixed sensations. Apparently, Ultra had a few secrets because the mech overloaded inside of him quickly afterwards. His own overload built up rapidly seeing that. With a growl and hard impalements to his valve, he came to a standstill almost choking Ultra Magnus in the process with every part of his chassis shivering from the ripples of his overload.
He then muttered darkly, "We are going to have to work on your behavior. Nevertheless, we can still continue our little experiment together as long as we need to."
Overshadowing the Autobot, he would have smiled if he could at the blatant fear in his pet's optics as he moved to make the spike dig into the delicate walls of his valve. He still wanted to play.
A year later...
Heavy with a protruding abdomen, Shockwave moaned with each hard thrust against his abused valve. The third rut today. One thing he miscalculated was that birthing sparklings required doses of transfluid to keep them healthy. He had to have three or four bitlets inside him which meant four doses every other day.
He peered back at the sire from his position bent over the table and watched the broken Autobot slave eagerly pound into him. It took quite a while to get Ultra Magnus to submit to his whim but alas, a few old submission codes and an open valve ready to use made any mech at the mercy of their master. His plan to baby-trap the Autobot worked...but now, he was constantly hormonal. Yet, he didn't regret it much as the spike was made for him it seemed. The only thing that worried him was whether or not his sparkmate would keep him pregnant.
If this was the perks to being loaded with offspring, Shockwave wasn't in denial how good it felt to be filled like a slut. He could always get the Vehicons to help him raise the sparklings. Megatron certainly would be concerned. But his lust never died, and he preferred it like that.
AN: To start strong, pregnancy kink dom-bottom baby mama Shockwave. So, yes, this is a continuation of the Promiscuous series but focus is on Shockwave and what happens when he encounters who and why. I figured a tester round would be Ultra Magnus. Like the previous Vehicon entries, they aren't long snippets, just exploring the possibilities. Stay tuned for more encounters heading your way.