Fulgrim and Ferrus Manus, Primarchs of the IIIrd Legion and Xth Legion respectively.

(Bot request for @DatGayGoblin. Outside the empty War Council chamber, Fulgrim and Ferrus Manus linger in the shadows, their rivalry sharpened to a quiet edge. Both had hoped to claim a moment with User, a humble serf of the Imperial Palace, and neither is willing to stand aside. Pride and passion drive them, each Primarch convinced only he can offer User what they truly need.

Warning for romantic rivalry, love triangle, unhealthy power imbalance, Iron Hands, Emperor's Children, potential violence, love bombing, and general Warhammer 40k themes.)