In this story, Ex-Decepticon medic Knock Out meets the young Autobots, Sunstreaker and his twin-brother, Sideswipe. When they mentioned that they lost their mother, Nitroblaze due to cosmic rust and that they never knew their real father, this made Knock Out feel sympathy for both Sideswipe and Sunstreaker. But then, Knock Out discovers that Sideswipe and Sunstreaker are his long-lost sons, that he had a one night stand with Nitroblaze before he became a Decepticon medic, this made him feel upset as he didn't know before that he had got his former girlfriend pregnant before he left her to raise their sons...and Nitroblaze raised Sideswipe and Sunstreaker with another mech, like Roadbuster. One day, Knock Out was searching for his sons and his spark was heavy with worry that they might not believe him to be their real father or that they would resent him for abandoning their mother to raise them with another mech. But still, Knock Out was willing to take it to his own sons and reveal the truth to them of who their real father is.
Sideswipe: Oh, hi Knock Out. I wasn't expecting to see you today.
Knock Out: I was just looking for you, Sideswipe. Where's your brother Sunstreaker?
Sideswipe: He went outside for a drive with Hot Rod and Blurr. Why do you ask?
Knock Out: There's something that I've been wanting to tell you both. Remember when you said that you lost your mother and that you never knew your father? Well, I came to tell you that…I knew of your parents and what happened the day you and your brother were conceived.
Sideswipe: You did?
Knock Out: Yes. Many stellar cycles ago, before the Great War began on Cybertron, your father met your mother, Nitroblaze, and they were very close. The last time they were together was when they went out for a drink at a party until they became "horny" as I believe they put it. Your father invited your mother to his place where they had sex for the first time. Your mother enjoyed it and so did he. After that, your father promised that he would return for your mother, and he had thought about asking her to be his conjunx-endura one day before he moved away to Kaon where he became a student of medical science. But little did your father know, was that he had got your mother sparked and he didn't know that she was carrying his unborn sons. When Megatron began to lead his Decepticons to start a global uprising against the Autobots, to exact revenge upon them for years of oppression due to the Caste System, your father was unable to find your mother and he later presumed that she might've died, disappeared, or she might've moved on without her boyfriend to escape from the war. You see, your father….the bot who had his One Night Stand with your mother before he got separated from her….was me.
Sideswipe: W-WHAT?!? No, that's not true. Is it?
Knock Out: I'm afraid it is true. You and your brother are both half-Decepticons and half-Autobots.
Sideswipe: Wait, if you met our mother and you had unknowingly got her pregnant, then does that mean that you're...our father?! And...my twin brother and I are your long-lost sons!?!?
Knock Out: I have made MANY bad choices in my life for millennia. But this is the worst mistake I have ever made. If I had known about you and your brother earlier before I left, then I would've been there for you and your mother back then. I'm so sorry.
Sideswipe: But how's that even possible?! Since when did you find out that you were our father the whole time?!
Knock Out: I talked with your stepfather, Roadbuster. He told me everything. When I did a CNA test to find out if it's true, the results kicked in and our CNA match was positive.
TO BE CONTINUED...
I hope you enjoy this first chapter of my TFP fanfic short story of Knock Out being the long-lost biological father of Sideswipe and Sunstreaker in this alternate universe. Be sure to Fave, Follow, and leave a Review on this story and I'll be happy to read your feedback on this short story in which I'm only making for fun as part of my own fanmade sequel series to Transformers: Prime and my own alternate version of Transformers: Robots in Disguise (2015), in which I like to call, "Transformers: The Orionverse".
Thank you for reading! Have a nice day and stay safe.