A whiff of expensive musky scent is coming my way.Yeah, I really wish they were all like this.Her smile widens as she clocks me ogling. "Come on in!" ...he says, amused.She seems assured and confident. Completely at ease. It's like she's done this before, although when arrangements were made she'd been at pains to say that she hadn't.I enter the house and follow her into the enormous lounge. She calls something over her shoulder but I don't catch it because my attention is lazered on her ass. “I didn’t mean to….” She started to say, “I mean, I didn’t think I….”“Would have that effect on me?” I finished.“Yeah, something like that!” she said.I gave her my best ‘WTF’ look and said, “Derrr, what effect did you think your amazing body would have on me?”“But I’m your sister!” she said as if stating the obvious.“And?” I asked.“And I perhaps should have known better!” she answered, now understanding properly. “Come on then, seeing as I’m here, let’s have a look!” she suddenly added, nodding. She turned me toward the mirror again. I watched as she stood behind me and slipped her fingers beneath the side straps of the thong and pulled it up beneath the garter belt and tighter into my pussy. Then she moved her fingertips lower...just until she could feel the heat of my pussy! My body reacted to her subtle touches, perfume, and soft voice. She felt me tremble...and I knew she could feel my wetness growing.She then reached up and adjusted the bra straps. Her boldness really surprised me. . Then she turned and slapped me in the face and asked if this turns me on.. I didn’t know what to say.. She asked me to undress.. I was hesitant. Then she slapped me again and said that she’ll inform my parents if I didn’t.. I removed my shirt and then my trousers.. My dick was flaccid.. She took my dick and slapped it.. It hurt.. She mocked me asking why I’m not having a hard on.. Then right before my eyes they both removed their night dresses..I couldn’t believe what I was seeing.. They were.