An B-Pretending-to-Be-O

A beta pretending to be an omega picks up an amnesiac alpha.

ABO, marriage before love, amnesia, pregnancy and childbirth, reborn, and probably a groveling-after-losing-you romance.

Alpha top, beta bottom. A short, trope-heavy, melodramatic outline.

Core message: I really want to read some A/B stories. Can anyone recommend any?