I usually drive home but today my car was in the garage. The tube station was just a short 10 minute walk so I tied up my coa,t grabbed my hand bag an... set off. Saying a quick goodbye to Steven who still sat busily at his desk.It was a cold night and as soon as I stepped outside I automatically felt my tender boobs harden. I looked up at the sky and was amazed at clear the night sky was. As I walked through the city I gazed at all the things that I am far to busy to ever notice throughout the. “Let me feel you ass-fuck me. Come on!” I looked down and saw that my dick was hard as a crowbar once again. Imoved forward and placed the head against the brown circle of her anus andtried to push. The head slipped in about a quarter of an inch and would go nofurther. “Lube it.” She told me. “Run your fingers through my pussy and thenput it on your cock.” I slid two fingers into her now loose vagina, wetting them thoroughly.I then jacked my cock a few times, getting it nice and slippery. . She'd made a complete spectacle of herself in front of everyone, and not for the first time.Thinking it best to leave her to her thoughts, David kept quiet also. He remembered his earlier puzzlement, so he took the opportunity to query the AI subvocally, «Is the Fleet Auxiliary about replacing Navy people on colony ships, and getting them onto warships?»«Affirmative, sir. The Fleet Auxiliary will be used for non-combatant missions, such as crewing colony ships, inter-system supply delivery and. She said, “Ok. Then you need to be my slave whenever we are alone inside the house. Also, in the morning after waking up and before sleeping, you need to drink my piss and eat my shit.”I was so shocked listening to all these coming out of my own sister’s mouth. But weirdly, I also felt very happy. I felt like my dream of becoming a slave was finally coming true. As soon as I called her by her name, she gave me a very tight slap. She asked me to call ‘mistress’. And I nodded.Then she asked me to.