My Hero Academia: The Duo of The End

Izuku Yagi and Katsuki Bakugou, two best friends, two partners-in-crime, two heroes-in-training. Were framed for stealing files from U.A and giving them to the L.o.V, they were betrayed by those they considered their friends and their own families. When they had arrived at Tartarus and were put in the same isolated cell, deep underground, the two had been silent for a whole week as they remember every word and every action their classmates and other students of U.A said and did to them...Katsuki and Izuku had been friends since childhood and never gave up on one another, even after Izuku was declared Quirkless, Katsuki stayed by his best friend's side. The following weeks in Tartarus, the two had trained non-stop, their quirks grew stronger and so did they. Katsuki knew about OFA and was also sharing it with Izuku as the Tenth User, how he found out was because the two never keep secrets, no matter how big or how small.

He became the Tenth user after their second week in Tartarus, due to the former Users deeming him worthy of sharing the Quirk with Izuku and since Izuku was made aware that he had unlocked his birth Quirk by the Users on the second night in prison. Izuku and Katsuki had changed a whole in the three months they were in prison, they were not only stronger, but they were taller and their voices were deeper and more menacing...they also had a lot of revenge planned for when they get out and back to U.A...all I'm gonna say is...the people that betrayed them, won't be able to sleep for seven weeks when the two are done with them