My Husband Is a Eunuch

A modern couple time-travels. Wife becomes favored consort, husband Grand Eunuch. They build power, stabilize empire. Wife wins Emperor's affection, pregnant, named Empress. She uses modern mindset to handle state affairs. Husband establishes Eastern Depot, eliminating enemies, protecting her. Emperor's early death, she installs young son, rules from behind curtain. She ascends throne, becomes Empress Regnant. Becomes great empress. Abdicates, enjoys peaceful retirement.