This Is Related To Your Heat/rut Au (?) Headcanons- Ngl I Never Thought I Would Hear/see The Words Sentinel

This is related to your heat/rut au (?) headcanons- Ngl I never thought I would hear/see the words Sentinel and cute in the same sentence but now that I look more at it it does seem like smth he would do. aaand if you don't mind me asking do you have any Sentinel headcanons or maybe some for 13 primes? ;>

Sentinel in heat thinks he is just the cutest, hottest, most irresistible bot on Cybertron, and he WILL get some spike!

I will make a master post of 13 Primes headcanons soon, but I’ll give you some A LOT more Sentinel~

When Sentinel goes into heat around the Primes, his whorishness increases tenfold. His most desired mates are Megatronus, Prima, and Alpha Trion. His frame views Megatronus as the strongest candidate, most capable of producing strong offspring and defending them and Sentinel. It sees Prima as the most desirable for genetic purity, since he’s the first Prime. He’s also big like Megatronus, which he likes. Alpha Trion catches his frame’s attention because of his cat-like beast mode and behavior, which makes him desirable for his agility and unique caretaking instincts. When Sentinel is around any of these three while in heat, he will be found rubbing up on them, touching them anywhere he can, whining and purring at them, and taking every opportunity that presents itself to bare his valve at them. Upon the slightest indication of interest in mating with him, he will immediately bend himself over the nearest surface or get on his servos and knees and spread his legs.

If his three favorites deny him for whatever reason (perhaps they are too busy doing important Prime things) Sentinel will go to the other Primes and loudly complain about it with whines, whimpers, and pitiful cries of despair that might have made them think he was dying if he wasn’t venting out his heat pheromones all over the place. As soon as he knows he has the attention of one of them, he zeroes in on them, flirting via touches and more of his begging whining. If he gets the attention of multiple, his slutty aft will bare his valve to them all and watch any who are interested fight each other for first dibs. Seeing any of the Primes fight over him for mating rights makes him obscenely wet.

And when one of them finally frags him? He’s so fucking loud about it that spit roasting him is common practice, just to make him a little quieter. Except when it’s Prima. Prima, the pinnacle of divinity, adores Sentinel, and the sounds he makes when he’s taking massive Prime spike in that plush, deliciously sensitive valve of his. Especially when he’s in heat. Sentinel is so loud, in fact, that during his first few heat cycles, some of the Primes would - aggravatingly - stop mid-round because they’d think Sentinel had overloaded and was getting overstimulated, when he very much had not. It took a while, but they did figure out the signs of Sentinel’s overloads: his legs squeezing their waist so tight they can’t move, his digits digging into their plating so hard it sometimes actually hurt, his wings arching up and out and shaking with the strain of release, and his cries becoming much longer and cutting off with sobs of pleasure.

Then, when his heat is finally satiated, the Primes gently clean him up (Alpha Trion will lick him clean like a fucking cat) and tend to any minor damage to his plating, including touching up his paint and giving him a nice polish, before all the participants snuggle up around him and let him cuddle them as he recovers from the ordeal. They’ll gently pet Sentinel, kiss him, hold him, and praise him, and he will often be so relaxed by the aftercare that he will slip into recharge right then and there.

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I know we have been talking about Prime! Optimus having baby fever, but what about… Earthspark Optimus with baby fever?

The Matrix wants someone in particular though, that big, strong silver mech who just so happens to have been more friendly with Optimus lately… he'd make such a good sire, filling the Prime with big strong cybertronians, like Primus intended

Hell yeah! I love me some earthspark megop :3

Optimus has been feeling strange lately: craving touch, feverish, and his forge aches. He knows he's charged up and in need of a good frag, but it's never felt like this. The Matrix is messing with him, it's the only explanation - its been begging him to frag and getting angry with him when he attempts to stave it by self-servicing. He knows what it's calling for - a sparkling, and not just anyone's.

Megatron's sparkling.

It's not like the two haven't interfaced before, or even been romantic together, but it's never been made official since after the war. Optimus suspects Megatron feels inadequate, and that if something bad were to happen in a potential relationship, any progress towards peace would be lost. It makes Optimus sad to see his dear friend like this, and offers him comfort and support, but the road to recovery is long and bumpy.

So he deals with it himself. He's a big bot, he can take it! Even if it infuriates the Matrix, he'll wait it out. Even when he feels achingly empty. Even when all he wants is to curl up next to Megatron and fall into recharge with him. Even when he weeps in his room at night because he's so frustrated and horny, and he loves Megatron so much but can't have him.

He didn’t realize that the Matrix was affecting Megatron too, though, because that big, strong mech he’s been dying to clang the bolts off of pins him against a wall one day, panting heavily, optics wild with lust and he’s growling - oooh sweet Primus he’s acting like a wild animal and Optimus melts in his arms. The Matrix is singing with joy, flooding Optimus’s processor with “strong mate”, “safe, protected”, “sparklings will be healthy” and Megatron’s thoughts swim with “protect mate”, “perfect, submissive, sweet” and “good carrier”. Megatron smells of training - fuck, isn’t he so strong? And Optimus smells delightfully sweet.

Megatron practically drags Optimus into his room and pins him on his berth, roughly inserting himself into his valve - somehow he just knew that Optimus wanted it rough. He holds Optimus’s shapely hips and begins pounding into him like his life depends on it. Optimus is wailing and moaning, so overwhelmed by how good it feels - so good to give in and finally get what he wants, he doesn’t know how he possibly made it by with just self-servicing. It’s both so much and just right at the same time, and before he knows it warmth blooms in his abdomen as he’s filled with transfluid. He begs for more, he needs to completely filled, he turns to look Megatron in the optics and pleads, low and desperate, to be bred. As if he couldn’t get more charged up, Megatron fucks him with wild abandon, making his mate cry out. After several rounds, Orion’s valve catches on Megatron’s swelling spike and fuck - he has a knot, he has a knot and the Matrix couldn’t be happier! There’s no way he won’t kindle now.

When Megatron’s knot deflates and he pulls out, he cleans Optimus up with his mouth. Poor Optimus has no energy left, softly moaning and trembling slightly as his sore valve is gently swiped over by Megatron’s mouth. He closes Optimus’s panel manually and whisper to him, “Sleep, dear. You’ll need it.” and Optimus allows himself to slip into recharge. Megatron cleans himself up and deals with some responsibilities, making sure to come back when Optimus wakes up. He kisses his forehelm and treats him like a delicate flower, as if he wasn’t just rearranging the Prime’s internals just half a solar cycle earlier. He presses a servo to his mate’s middle, feeling the warmth he was looking for - Optimus’s forge has kicked online.

A few weeks later they still haven’t looked into Optimus’s spark chamber, too worried that they’ll jinx it. But when his abdominal plating distends outwards ever so slightly that’s when they know for sure.

Megatron’s the best sire a bot could ask for - he’s powerful and strong but so considerate and gentle. He finds the whole situation quite poetic.

And if you’ll excuse me, I’m gonna go think about this FOREVERRRR

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