PK POV
I could feel his frame shaking.
"Wait! Could we uh... i-it's just that I've never... uh, you know, done it in this position."
"Oh, alright I'll start off slow." I thrust my spike gently into his port and I could feel his frame tense up. I thrust again, slowly. "Mhmm." I could hear Magnus moan, it sounded so deep and it just turned me on more. I pulled out so my tip was still in and thrusted again. I tried to keep a steady pace but I wanted to go faster.
"Nngh, harder." He said quietly.
"What was that?" I ask by his audio receptors.
"Harder." He repeated only slightly louder, his helm was still down.
UM POV
Predaking starts going faster, "I still can't hear you." He responds as if he's teasing me.
He thrusts harder and starts biting my neck cables. I can feel his glossa trailing up to my jaw frame and I give in.
"I SAID TO FRAG ME HARDER!" I shout angrily. Predaking stops abruptly and looks at me shocked, oh Primus I hope he didn't take it the wrong way. Then an evil grin spread across his face. "Yes sir." He quickly grabs my shoulder and pins me face-down on the table. I tried to get up when suddenly I was pinned back down and I could feel him thrusting his spike into me, hard and fast. I tried to tell him to slow down but I couldn't, I couldn't even think straight. All I could do was moan and growl, while my servos held on to the edge of the table tightly. The sound of our metals against each other sounded great in its rhythm. I could hear some grunts and growls from him. He bit my shoulder and kept going harder. Energon was starting to leak out . My frame's temperature rised and I could feel my climax coming. But there was no way in the pits I was gonna go first.
And I don't think Predaking wanted to be first either. I was just gonna have to wait him out.
But this felt so...right.
The way his denta's were digging into me. His talons piercing my sides. His spike stretching my walls to their limits. I never knew I was into interfacing with a mech. He placed one of his servos around my spike and started pumping it.
Oh Primus I was gonna spray my trans fluids everywhere.
I could feel Predaking's frame shiver and his pace became sloppy. His breaths were hot and his delta's grip grew tighter on me. He began to slow his pace down so I pushed my aft back so his spike went straight in and that did it for him.
PK POV
I couldn't take it anymore! My trans fluids shot right through me as I released my fangs from him letting out a short roar as my wings flapped up. My servo was still around his spike and I could feel the fluids coming out until we were both finally finished.
I was so tired, I nearly collapsed on him.
We both sat up on the berth, it was only made for one 'bot at a time so there wouldn't be enough room for us both to lay down. I watched as he rubbed his servo on his shoulder trying to stop the light bleeding and it was probably sore.
"So I guess we're mates?" I say as I shrugged. I was kind of hesitant to ask, I hope this wasn't like a phase or a one-cycle stand. He looked up at me with a smile and responded, "Yeah, I guess we're mates." He looked at the ground, slightly blushing with his shy smile.
A look of horror crossed his face and he quickly ran to the exit of the cave and didn't stop until he was at the entrance of the cave. He looked up to see the sun setting and pulled up his commlink history realizing he had missed several calls.
I walk to his side resting a reassuring servo on his bicep. "Scrap! How long have I been gone?? I need to get to base now."
"What is wrong?" I ask worried.
"I only suppose to be gone for a few hours not a whole cycle! I turned off my commlink thinking I wouldn't be needed." He responded in a worried tone.
"Ratchet I need a..."
UM POV
I looked down at myself. How was I suppose to explain this to the team. It looks like I just walked out of a fight! "Ultra Magnus? Do you need a ground bridge sir?" Ratchet asked.
"No, ignore that order, doctor, I will be returning to base manually as soon as I can."
I look up to Predaking and frowned sadly. "I have to go."
"I could fly you back to the Nemesis." Predaking said quickly.
"I appreciate your offer but your signal would show up on the radar and they would probably fire at you."
"Hmm." He looked around the cave. "I suppose this cave has been blocking both of our signals."
I nod my head in agreement. I didn't even process about that until now.
"So I'll see you in a few cycles." I say, to be honest I wasn't sure when I could sneak out again.
"Yes I suppose so." He looked down at the ground again, and seemed almost sad.
I reach up to put my servo around the back of his neck cables to pull him down so I could peck his dermas then I transformed and left.

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Alliance (TFP Ultra Magnus x Predaking)
FanfictionPredaking's guilt for harming Ultra Magnus grows and decides to become allies with the autobots. With each passing cycle the treaty between their two kinds is being worked on. Fortunately, Magnus' and Predaking's feelings for each other grow. I do...