You and Wheeljack are married but not spark bonded. It's been something Wheeljack has been thinking about, and today, he's decided to ask you to spark bond. Afterward, the two of you do a little celebratory fragging.
Warning: Sexual content.
Wheeljack's P.O.V.
(Y/N) and I have been married for ( marriage length), but not spark bonded. I thought there was only one way to do it; put a piece of my spark and Energon in (Y/N), and I don't want to do that; I pray I'll never have to.
Being a scientist, I'm curious if there are other ways to spark bond with a human. Perceptor is interested in this idea and has been helping me.
"Spark bonding is marriage, Wheeljack; I don't know why you want to see if there's a way to spark bond — or half spark bond — with (Y/N). You two had a lovely wedding. I can tell you now; you won't feel her emotions or know her thoughts. Maybe it'll help you locate her like a dog can locate someone by scent," Perceptor argues, "Is this how you are asking (Y/N) to try to get pregnant?"
"I'd talk to her about having a baby. You won't understand, Percy."
I know it's not going to be the same as spark bonding with another Cybertronian, but I believe spark bonding is like a promise to be together forever — even if it's not always that way — I want to do this with (Y/N). Our research is showing it's possible to spark bond with humans.
(Y/N)'s P.O.V.
Wheeljack has been very invested in his current research but won't tell me what he's working on. Wheeljack wouldn't cheat on me or lie.
Wheeljack's P.O.V.
We're almost done with our research, but it's still going to be hours before we're done.
(Y/N): I'm waiting for my doctor *wink*
The attached photo is amazing. I didn't think this would turn me on, but I would love to run out of the lab right now and frag (Y/N). Remembering Perceptor is watching me changes my mood to embarrassed.
Wheeljack: accurate
(Y/N): Thanks, you done yet?
Wheeljack: sorry, babe; it'll be another four hours.
(Y/N): Ok ️(sad face emoji)
Looking at the time, it's five P.M. Dang it; I think I just turned down (Y/N) wanting a dinner date. I know she also has an early shift tomorrow, so she'll likely be in bed by the time I get back to our room.
We finish at nine with great results. It's a shame I'll have to wait until tomorrow night...
"(Y/N), I didn't think you'd be up."
"It's only nine, I'll be fine, and I wanted to wait for you to get back." She sits on the berth, waiting for me.
(Y/N)'s P.O.V.
I wanted to wait for Wheeljack to get home to go to bed, but since I made that image, I've felt the desire to do it. I'm hoping Wheeljack is turned on with the photo l sent him.
Wheeljack shrinks to human size, gets on the berth, and cuddles with me. He nuzzles my neck before removing his mask. There's seriousness in his optics.
He sighs, "babe, c-can I ask you something?"
"Wheeljack, what's wrong?"
"Nothing, I...um...I have been working on a way for us to spark bond."
"Wheeljack, I'm—."
"I know; it's very minimal, and at most it's like a promise to stay together."
He tells me I poke my finger and let blood and my fingerprints make contact with his spark.I feel myself getting wet, knowing the only way Wheeljack can do his half is if we do it, but the difference is my DNA will be in his spark while his will die off... unless we have a baby, which we haven't talked about. Even if this is his odd way to say, let's try for a baby; I'm for it.
Wheeljack brought a clean needle for me to use. I poke my finger and squeeze it to get more blood out before putting my hand on his warm glowing spark. Wheeljack says the feeling is the same as if I was a cybertronian and our two sparks made contact. Interestingly, this makes him moan, but I've learned this is also a form of sex for transformers. A few minutes pass before he says it's done. He tells me to wash my hands.
As I'm in the bathroom, I wonder if a tiny amount of Energon is in me, but not enough to harm me? I didn't expect to see Wheeljack's holoform approach me as I look in the mirror, nude and...oh my, I guess my image did turn him on. As soon as I'm done, Wheeljack turns me around and kisses me as he unclips my bra strap and starts pulling down my pants and underwear. I break the kiss to finish undressing, but I didn't think Wheeljack would carry me to the berth. He even prepared for this by covering an area with a sheet so the cold metal wouldn't kill the mood. He resumes making out with me before squeezing my breasts
"You planned this, didn't you?" He asks, "starting with the photo, so naughty."
"Too bad you can't spank me."
"I can punish you in other ways."
I should have known that meant he'd go in, but it's still unexpected, so is how Wheeljack is going slow. I wait a few minutes.
"What happened to punishing me?" I ask.
Wheeljack takes that as his cue to go faster to the point my breasts are bouncing around. He enjoys my moaning. This lastsa good five minutes before he pulls out and lays next to me, panting, pulling me closer to him.
"I love you," he pants.
"I love you, too."
A/N: I'm not sure if we could call this a minimally invasive transformer/ human spark bond or not. The more invasive and effective way I know of is putting a piece of spark and Energon in the human, but it's still risky and only used to try to save their life.