Disclaimer: Do not own.

A/N: My first try writing this challenge. I'd really like to know how I did with it. Any mistakes you tell me about will be fixed as soon as I can fix them. Anyone wondering why this pairing? Well, Optimus was the only one that I thought of pairing Sideswipe after I finished writing Insanity, but I had no idea how to start it and the pairing demanded to be written now. So, I volunteered them for the challenge.

Optimus Prime/Sideswipe in Fifty Sentences

Comfort
After coming out of surgery, Optimus was surprised to find that Sideswipe had volunteered to be his caretaker and even more surprised when he realized the Lamborghini worked hard to make sure he had every comfort available.

Kiss
For a second, Optimus considered telling his SIC the best way to make Sideswipe shut up, but he doubted Prowl would be willing to kiss the red twin to do it.

Soft
Optimus was surprised at how soft and vulnerable Sideswipe could be with him until the red twin confessed to have never been in a relationship before.

Pain
When Prime came online after getting buried under the rocks all he could feel was pain and arms around him while Sideswipe's voice whispered in his audios that everything will be alright.

Potatoes
It involved potatoes, mice, Ironhide and he'll probably spend time in the brig for it, but he knew Optimus was grinning behind that facemask and it made it all worth it.

Rain
It was raining when they first kissed and when they first dared to interface, so when it started raining after Prime left on a mission, Sideswipe knew it was the moment to say goodbye.

Chocolate
They might be unable to process chocolate but that didn't stop Sideswipe from celebrating the human holiday for love and paying a fortune to Smokescreen for energon goodies to give Optimus.

Happiness
There were few times that Prime had been truly happy, until he admitted that he more than cared for Sideswipe, because every time the Lamborghini walked out of the battlefield alive Prime was sure his spark would burst from happiness.

Telephone
Prime was not amused when the police told him, in great detail, how Sideswipe had managed to take out the phone service of half the city during a prank.

Ears
Somehow it didn't surprised Optimus that Sideswipe had sensitive audios, but he never expected to be able to make him overload by touching them in the middle of a briefing with half the warriors present.

Name
When Optimus Prime met the mechs that had been forced to fight for the Decepticon's entertainment, he was surprised when a red mech approached him and asked for him and his brother to join the Autobots but, much to Red Alert's dismay, he welcomed them without even asking for their names.

Sensual
There was nothing more sensual to Sideswipe than being able to remove Optimus' facemask, as he knew that, unless it was an emergency, not even Ratchet had that privilege.

Death
Sideswipe knew death was always a possibility for them, but watching Optimus' funeral broke his spark and made him wish they'd been able to bond so he could follow his leader and lover into death.

Sex
Everyone gaped at Sparkplug as Optimus apologized to him and the human waived him off and only asked that Optimus and Sideswipe remembered to lock the doors before having sex on the desk.

Touch
It was in the way Sideswipe touched him as if he was made of the purest of crystals that made Optimus Prime realize the warrior was with him for more than a fun night.

Weakness
If there was one thing Optimus Prime prayed to Primus for, it was that Megatron never learned that his greatest weakness was now a frontline warrior that liked to annoy Seekers as a hobby.

Tears
Ever since meeting the humans there were few times Prime wished he could shed tears like them; knowing that Sideswipe had a small chance of surviving the surgery was one of those times.

Speed
Optimus wasn't as fast as him, but Sideswipe knew that it wasn't the speed that counted, but reaching the goal no matter what happened on the way.

Wind
Sideswipe used to think Optimus was as immovable as the Earth's mountains, until one day he watched the wind slowly erode the mountain and realized Prime was like the wind: gentle and refreshing when calm, devastating when angry and (when given enough time) able to take down even the biggest of mountains.

Freedom
There were times that he wondered if Sideswipe was with him because he felt he should be or of his own free will.

Life
Sideswipe's old life was destroyed when the Decepticons captured him and his brother and his hopes of getting it back got crushed under the heavy blows of the other gladiators, but the day he met Optimus Prime he found himself believing that as long as he lived there was still hope.

Jealousy
He would never tell Sideswipe he was jealous of the bond he shared with his twin; just like Sideswipe will never tell him he was jealous of the bond he had with a femme back in Cybertron.

Hands
He knew he was committing sacrilege every time he touched the Matrix bearer with his energon-stained hands, but every time he was allowed that privilege he felt that all of his bad actions had been forgiven.

Taste
Sideswipe was sure that every time he was with Optimus he got a taste of what freedom truly was, but Optimus believed it was the other way around.

Devotion
Optimus would've given anything to pretend that he was just a normal worker having a good time with his lover, but Sideswipe's almost complete devotion for him made it impossible to lie to himself.

Forever
Sideswipe would like nothing more than to promise Optimus to be with him forever, but he knew that every time they entered the battlefield could be their last so he never told his leader that.

Blood
Sideswipe looked at the bloody field and felt his spark break knowing Optimus would only blame himself for the death of the humans today and, ultimately, for bringing their war to this planet.

Sickness
The medic knew that twins often fell sick at the same time, but he refrained from asking Optimus why did he get Sideswipe's virus before the yellow twin could start whining about being sick too.

Melody
There were only two Cybertronians that knew he could actually sing and though he had sung to her all the time; Optimus only felt the need to create a melody just for Sideswipe.

Star
One night, as he looked at the now familiar sky and star patterns while Sideswipe was in critical condition; Optimus looked at where Cybertron was supposed to be located and wondered if it was all worth it.

Home
He wasn't Sideswipe's home because that was Sunstreaker's position since the moment they were created, just like Sideswipe wasn't Optimus' home because that position had been given to Elita-1 long before the two met; and even though they both knew that they refused to believe it.

Confusion
Optimus walked in looking confused and Sideswipe couldn't help but pull him aside and ask him what was wrong, though he never expected to hear his leader say, "I think your brother just gave me the talk."

Fear
Optimus's worst fear came true when Sunstreaker fell in battle and he had to watch as Sideswipe survived as a ghost of himself until the day he entered the battlefield and, for the second time in his life, he had to watch as the one he loved died at the hands of Megatron; only this time there was no one to bring Sideswipe back to him.

Lightning/Thunder
One day Optimus watched the twins spar and ended comparing Sunstreaker to lightning and Sideswipe to thunder and though the two together were amazing, Optimus was more fond of thunder.

Bonds
Sideswipe was denied the chance of a bond the moment his spark split in two and Sunstreaker was born; but it didn't matter to him because Optimus had used that chance before they'd even met.

Market
Optimus had many secrets; one of them being that he'd met Sideswipe at the market back when he was still Orion Pax and he'd been looking for a bonding present for Ariel.

Technology
Sidewsipe grinned and Optimus had the sinking feeling that someone had finally told the red Lamborghini about Furbys and he should be expecting an illegal shipment of the human technology along with a short circuiting Red Alert very soon.

Gift
It was both sad and amazing that the best gift she gave him after more than four million years of separation was a transmission telling him that if Sideswipe made him happy then who was she to stand in their way.

Smile
Everyone knew that Optimus could have any Autobot he wanted and that there were many good looking models in the Ark, but what they didn't knew was that he preferred Sideswipe's crooked smile above anyone else's looks.

Innocence
Optimus was always surprised at how young and innocent Sideswipe looked during recharge.

Completion
Even though he shared one spark with his brother, Sideswipe felt truly complete whenever he was near Optimus.

Clouds
Optimus didn't knew why the other one insisted they go cloud-watching, but he always gave in and humored Sideswipe even if he had to pretend to see figures when all he could see were cumulus.

Sky
Optimus was almost sure his lover was a recycled flier, because how else could he explain the jet pack and the red twin's habit of jumping on Seekers and letting them take him upwards into the skies, even when Sideswipe knew they only wanted to see him fall to his death.

Heaven
Optimus didn't knew much about human religion, but he believed he had enough grasp of it to say without doubt that heaven for him was managing to get the red twin still and quiet for a few joors, preferable in his arms but he wasn't picky.

Hell
Optimus thought hell was losing his life and love to war and reformat, but it turned out that hell was losing Sideswipe to his twin's death and actually feeling grateful when a shot of the fusion cannon allowed the red twin to rejoin his brother in the Matrix.

Sun
Optimus often came to the conclusion that Sideswipe was like the sun, both were fiery, gave life to those around him and were condemned to die in an explosion.

Moon
When he first saw the Earth's moon, he couldn't help but think it was beautiful and cold like his mate back on Cybertron, but he also couldn't help but love the Sun much more than the Moon.

Waves
Optimus liked to watch the sea and marvel at the constant movement of the waves and the way the waters seemed to be alive and change moods in a matter of nanokliks, so it wasn't a mystery that he was drawn to Sideswipe for his short attention span and inability to remain still.

Hair
Sideswipe's optics brightened as he tried and failed to suppress a laugh when Ironhide walked in with the Cybertronian-sized human wig the red twin managed to glue on him and Optimus calmly looked at his friend and said, "Glad you could join us, Ironhide. I never thought of you as a brunette though."

Supernova
War brought them together and they fought together with everything they had knowing that it was war that would separate them in the end, but not before their deaths consumed everything like a supernova.