My sister pushed herself up onto one elbow, then she too untied her top, tossing it over with Vicky's. I'd seen my sister's breasts last night, but it was darker, and we were all drunk. I shuffled across to her on my knees as she lowered herself down. I hoped she didn't look back because I had one hell of an erection and it was tenting my swim shorts quite visibly. "Alright. This might feel a little cold," I said. Pouring some of the oil onto my sisters bare back and rubbing some into my hands, I proceeded to rub it into my sister's exposed flesh: across her shoulders, down...