"Chloe von Einzbern was not an ordinary servant. She replenished her mana through bodily fluids exchange with her master (she liked to call him her "oniichan"). But who knows the result was a new life, created from their love, growing inside her body..."
"...Now Chloe wanted to punish her oniichan by teasing her, but something happened?"

A set of fanart of Chloe von Einzbern giving birth, made by MaiKatz.14