Turns out he had been fucking Sushila bai for close to 20 years. She had started working in our house when she was 18. Dad was 19 then. Initially it was teenage hormones and he deflowered her before she turned 19. In the beginning, it was very lovey-dovey and they sneaked around whenever they could. Then he got her pregnant and when she was around 20 & made her get an abortion. Thereafter, he became more dominating and rough with her. At 23, Dad married Mom in an arranged marriage. Mom came from a simple, middle class background. On their honeymoon, Dad apparently fucked her brutally. Then he gave her a choice -- either Mom continue to bear the brunt of his violent lust or he continue to use Sushila to satisfy his more 'basic' needs. Mom agreed to the bargain on condition that he never get Sushila pregnant. Convincing Sushila to accept the arrangement wasn't that hard apparently. Dad had her tubes tied and continued to use her body.
I asked him how come I had never caught them together before. He said that since she lived in servant quarters attached to his office downstairs, he used her there and in his office. Usually he made her give him blowjobs or fucked her in his office, bent over his desk or in her quarters. Very rarely was she allowed into his own bed. That day happened to be one of those days.
While we were sitting and chatting, Sushila came out. She did not know I was there. She came into living room, towel wrapped around her body. Her long luscious hair was open and wet. She was startled to see me sitting there and made a move to run back into bedroom. Dad grabbed her hand and pulled her to him. Sat her down in his lap as he sat on sofa. He opened her towel exposing her full, voluptuous naked body. She begged him not to, but he gave her a slap on her face and pulled her hair angrily.
Then he pushed her to the floor and told her "ab saali tu choos Navin ka lund" ("now bitch, suck Navin's cock").