As we are cleaning up and picking up all the stuff that got knocked down during the sex, I ask “why did you do all that shit to get me aroused a...nd angry at the same time”. “Isn’t it obvious” she says acting surprised I even had to ask. “I wanted rough, hard angry sex. When you ask for rough, hard angry sex, it is never rough, hard or angry enough”.As I am leaving the office I am wondering, that was great, but what is she going to do next?The Bank Branch. She's sitting back in her chair with a rapt expression on her face, legs spread wide apart and her panties in her hand,"Sammy what on earth are you doing?" I say gently to her and reach down to take the panties from her hand, "And Tommy, please take your fingers out of Sammy's pussy" Sorry mummy" he says and smiles at me as he licks them eagerly, "But she needed the loo and I was just trying to help her out" Hm, all right darling, come on Samantha I'll take you to the toilet" Can I have my. She increased her tempo as he got her more excited, tasted his pre-cum drizzling from the tip of his cock. He knew that she was on the verge of getting a mouthful of hot cum if he didn’t pull out, and he wanted to feel her pussy gripping his cock again before he came.He pulled his throbbing cock from his sisters’ mouth and turned around to settle his hips between her legs. With a groan of satisfaction, he pushed into her wet and willing pussy, feeling her inner muscles clamp down on him as he. ..aah...ahh... and my ugh...ugh...ugh.. became faster and deeper. She suddenly became somewhat limp, and I realized she had orgasmed and no longer was using her legs. I was the one lifting her up. With a few more strokes, I orgasmed explosively, and we embraced for a long time. I felt the slow ooze of vaginal fluid and semen onto my testicles as my penis grew limp inside her. She finally stood up, carefully, and went to pour coffee into two mugs. We had breakfast and then went out and washed.