I'm not entirely sure specifically what 'six x rex yaoi fanfiction' is about as it's not a widely known common title. But generally, yaoi fanfiction often involves male - male romantic relationships in a fictional context.
Fanfiction about Rex and Six could also involve a mission where they are sent undercover. They have to pretend to be ordinary people in a community that is on the verge of being overrun by E.V.O.s. They need to figure out how to stop the E.V.O.s without blowing their cover, and in the process, they learn more about each other's personalities outside of the battlefield.
One interesting story could be about Agent Six and Rex going on a joint mission that takes them to an unknown planet. There, they have to face strange creatures and rely on each other's unique abilities to survive. Rex's ability to create various weapons with his Omnitrix and Agent Six's combat skills would make for an exciting adventure.
You could try looking on popular fanfiction websites like Archive of Our Own (AO3). They have a large collection of various fanfictions including yaoi ones.
One popular 'Six x Rex' fanfiction might be 'The Bond Beyond'. It explores a unique relationship between the two characters. It delves into their shared adventures and how they rely on each other in different situations.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fan - created works from various fandoms, including Ben 10 where Agent Six and Rex are from. Just search for 'Agent Six x Rex' in the search bar, and you'll likely find a bunch of relevant stories.
One great 'Six x Rex fanfic' could be about their adventures in a post - apocalyptic world. They might team up to fight against new and dangerous mutants.
You can try looking on some well - known fanfiction websites like Archive of Our Own. There are often many different types of fanfics there, and you might be able to find some 'Six x Rex' ones.
Rex found himself suddenly in the middle of the Avengers' compound. Confused, he looked around at the heroes going about their daily business. Tony Stark was the first to notice him. 'Who are you, kid?' he asked. Rex stammered out his name. Thor then walked over, his hammer in hand. 'You seem out of place, small one.' But as the Avengers started to question him more, they realized Rex had a unique set of skills. And so, Rex joined their ranks, going on adventures and proving himself to be a valuable addition to the team.