Shoujo Ningyou

A girl forces herself not to feel anymore after years of sexual abuse from the master of the house where her father is a chauffeur. But then her father and the master die in a car accident, and she's left to live with the two sons...who both want her.

Note: Includes the extra chapter "Aquarium (アクアリウム)", published in Bessatsu Shoujo Comic 1999-07