As we got closer, I could see she was very well shaped. Her swelling breasts were pushing up and out against the fabric of her dress; a light weight c...otton, knee length dress. I could see the outline of her bra against the fabric as we finally were but a few feet from each other. As our eyes met, the instant bond between us was undeniable.Without speaking a word, not knowing each others' name, I reached my hand out to her. As she took my hand, both of us knowing that this was meant to be, we. I felt like a spectator. Then one Friday I had stopped on the way home to pick up a couple of bottles of wine and I ran into one of my buddies at the liquor store. I invited him to ride over to my house and hang out. He and I entered the kitchen and grabbed a couple of cold beers. I said lets go set by the pool, as we headed down I could see my wife laying in the sun, she was on her stomach. He and I sat down in the lounge chairs and as we stretched out he said , buddy you have it made. I asked. He laughed and pushed away from her, gliding through the water, the bikini top still held high above his head. "What'll you do if I don't?"She swam after him, face already warm from the sun heat further in embarrassment.Reaching him, she glanced around to make sure no one else was looking, then tried to grab his arm with both hands. There was a tingle through her as her obviously erect nipples were suddenly exposed to the chill water, but she tried to ignore it, gripping his hand and trying to. My sister is 15 and about 5'4 with reasonable sized tits, at least a D cup. I had never really thought of my innocent younger sister as the type of girl who masturbates when she has free time, obviously this came as a big shock to me when i turned around the door.I continued to watch for a while knowing how wrong what i was doing was. As i watched i started to feel a slight bulge forming in my trousers. I couldnt resist watching her for a while longer until she came. She looked so small and.