GF's sister....She is gorgeous!

We had all had a lot to drink...But ....
I couldn’t resist going into Lily’s room. She was peacefully asleep. Being a very hot evening she was lying on top of the bedsheets and to my joy had discarded her pyjama bottoms. Also her legs were apart and I could clearly see her delightful cunt and protruding labia lips.
I couldn’t help myself and gently touched her flesh.
She squirmed a little - I stopped - then ventured in again. It was too much to bear doing nothing and at this point I didn’t care. I just had to do it.
I licked my middle finger and pushed it gently up inside her.
She squirmed a little but still did not seem to wake. I gradually increased my fingering, very gently at first but increased with own excitement. Her body began to move rhythmically with my hand.
She soon spoke and said quietly ‘what are you doing to me?’
I could see that, although she may have been a little shocked she was actually quite enjoying it.
‘Do you want me to stop?’ I replied.
She didn’t answer.
I carried on with my finger in her cunt and increased my frigging as her juices began to flow. She got very wet so I pushed in another finger, massaging her clit with my thumb too.
‘You shouldn’t be doing this’ she said.
‘Do you want me to stop?’ I said again.
She carried on with her body movements as I masturbated her until she was gasping.
As I removed my fingers she cried, ‘ No, Carry on. I like it. Don’t stop!’.
As I removed my clothes I said, ‘Lots more to come now Lily.
I climbed in bed with her, pulled her slender legs up to her shoulders and put my cock where I had wanted to put it all day!
She gasped and then cried out ‘ Oh - oh - oh don’t tell Jenny will you? Oh my god….’.
Well with that response I was delighted !!!
I slide my hard cock up into her tight wet cunt. She was in heaven and so was I too! I fucked her slowly for a while then as we both became more excited I fucked her harder. The harder I did it, the more she yelled for me to do it harder still. We bucked and fucked for a while before I finally exploded as far as I could thrust up inside her tight cunt.
I had given her the fucking of a lifetime.
I was definitely the first in her that tight, younger sis wet hole but it wasn’t the last time for me or many others too.

I had fucked the brains out of her that night and knew then - I was in for a good holiday.……..