"I needed to ask you something. I was not spying on you." Mom stuttered. "Do not worry about it mom." I said covering up my hard on. "Max, I have been...lonely without your dad, you know." "Sure mom no worries. I miss him too. You do not need to be lonely, whatever you need just let me know." I said missing what she was saying. "I need .... well, um, I am really horny and need you." Mom said as moved to me and kissed me, her hand going to my hard cock. Me being buzzed and horny was not good at. ..but as she peeled it off to reveal an ample cleavage in a black lacy bra I didn't care . Off came her skirt to reveal matching knickers and I still hadn't removed anything was just watching her with a shocked smile on my face . " Well turn it on and get in " she said as she slipped her knickers off and then unclipped her bra to reveal a cracking big pair of tits with huge nipples In she stepped as I took my t shirt off , jeans down and then I was completely naked as I stepped into her cubicle. Now, it’s too late. You tried to get me cheaply. Now, you have to fill a position or two.”I said, “Doctor Glover, Karen graduated magma cum laude but the college only thought she was worth an instructorship. The university where we’re going sees her value. Learn from the mistake you made.”We left shortly thereafter.Karen accepted the assistant professorship and I told Dad that wee would move to the BG home office. We began to look for another house while Karen’s parents made their plans. The. I looked up and saw in the mirror that she was staring at me and smiling. She knew that I had been checking her out and she was posing for me. When my gaze met hers she winked. That's when I noticed that Lisa too was looking right at me in the mirror. Lisa was till sitting on the bed, leaning back against one elbow while her other hand was absent-mindedly playing in her pussy. The scene was unreal. I did not know who my sister was any more or what she was capable of. She had turned into this.