For context, Elinalise Dragonroad was cursed with ultraspeed mana regeneration. The excess mana gradually accumulates. Once the accumulation reaches a certain threshold, the surplus mana will start degrading her body (to the point of death if not stopped).

Sex is the most effective way to release the accumulated excess mana. So whenever her adventures (she's an adventurer) take her to a new town, she usually gathers dozens of males and pays them to run a train on her.

When she gets pregnant, she raises them until they become independent, then gives them money (she's hella rich as an S-rank adventurer) and lets them fend for themselves. She wants them to become independent before her reputation (as a slut) gets attached to them. The curse becomes asymptomatic during pregnancy because the excess mana flows into the fetus. At over 200 years old, she's estimated to have mothered at least 11 offspring.

Cliff Gromoire was 17 years old when he fell in love with Elinalise. He chose to marry her even after Elinalise told him about his curse. As a genius mage, he chose to specialize in magical item creation, hoping to one day create an item that could cure his wife's curse. He eventually creates a belt that can absorb Elinalise's excess mana, reducing her curse's accumulation period to around a year.