[JohnSmithJones]

My sister was always very shy about being seen by the men in the family when she was undressed, so I hardly ever saw her exposed.

Though my mum was quite comfortable wandering around in her bra and knickers (or bra and half-slip) in the mornings, my sister didn't like to be seen in her underwear. A few times I did catch her in her bra and knickers, and she would hurry back into her bedroom and close the door. She often wore thongs so her knickers were quite revealing, which is probably one reason she didn't want her brothers seeing (I did once or twice get a good view of her bum in her thong).

My sister has big breasts (I think a D-cup), but I had hardly even seen them in a bra. Though one day I happened to see her topless. It was a summer day and I came home from my summer job (I was on holiday from university and my sister was 19).

I didn't realise anyone else was at home, but when I went upstairs I saw my sister out of the window. She was sunbathing in the garden and had taken her bikini top off. She was lying on her front so her boobs didn't show. Our garden was fairly private, though if the neighbours on one side came out they would have been able to see her.

She clearly didn't know I was there, so I watched for a few minutes. Suddenly, I realised my sister had heard a noise from nearby and was worried the neighbours had come back and might see her. Clearly concerned about being seen topless, she got up, frantically grabbed her bikini top and rushed back to the house. Not realising I was watching from upstairs, she gave me a great view of her big boobs, bouncing as she rushed inside.

As it was my sister it wasn't sexy, but I was more curious to know what her breasts were like. She had curvy boobs, and I saw that she had quite big areolas but they were pale pnk, not darker. I had to admit she had a very nice pair of tits.

I had to laugh, thinking of she was shy about me seeing her in her panties and bra, and I'd just had a great view of her bare, bouncing tits.