Quick Transmigration: The Abandoned Wife Brings Her Child, and the Heirless Emperor Begs Her for an Heir

[Quick transmigration + possessive pursuit + childbirth + no fixed pairing + male leads who cannot have heirs + male leads' first relationships, heroines with pasts] Shen Qingyuan was born frail and no medicine could cure her. As she lay dying, she was bound to a Childbearing System. If she bears a child for the male lead who cannot have heirs in each small world, she can regain a healthy body. But in every world, she's already married and surrounded by children. System: Your target isn't your husband. It's the emperor or powerful official destined to have no heirs. First life: She's a discarded empress imprisoned in a palace. Her son is still young, yet she must bear an heir for the enemy emperor. Second life: She's a cast-off marquis's wife with a young child, yet she's expected to bear an heir for the new emperor, a madman. Third life: She's the empress dowager's niece, married into the imperial clan. Her cousin, the emperor, presses her at every turn: “I have no heir. The realm needs you to bear one.” Fourth life: She's a princess sent to marry for peace. She already has a prince consort who is a powerful official in the enemy state, yet she must bear children for the young emperor. Fifth life: ... Sixth life: ... Seventh life: ... The world calls her shameless for abandoning her husband and children. But looking at her increasingly healthy body, Shen Qingyuan lowers her eyes: What's a reputation worth if I can stay alive? But later, those cold, unyielding male leads who couldn't have heirs all go red-eyed and lock her and their children away in the imperial palace, consumed by obsession: “You bore my child. You won't escape me for the rest of your life.”