Vathara has posted and finished a few new stories in the last month, but her newest one that is just starting up looks very promising to me, based in part on his last outing into the MCU. This one is a Sekirei/Avengers crossover called "The Great Escape".
http://archiveofourown.org/users/Vathara/pseuds/Vathara
http://archiveofourown.org/users/Vathara/pseuds/Vathara