Peter gets raped by something in the dust world. Bucky has flashbacks to comforting and protecting Steve, combined with wish fulfillment wishing someone protected him from HTPs.

How this plays out? Up to filler.

I just want Peter crying and hurt and Bucky with his head a bit scrambled gathering Peter up and helping him with his head all mixed up.

Bonuses for Peter being scared of and for Bucky, because he acts erratically.