My sister was drunk

Our parents were away and my sister Chloe 22 decided to have a party at our house, I'm Arnold 25 and I was at work on the night shift and I left home at 5 30pm to start at 6pm and so Chloe thought she could have a party and nobody in the family would know. But there was a fire at my workplace and everybody was sent home early. It wasn't serious but there was to be an investigation and so only those who worked in area that burnt were kept there and the rest of us sent home at 10 30pm. I got home just before 11 and the party was breaking up and most had already left. The house was a mess and I started looking for Chloe and found her sitting on a chair asleep. After making sure all her guest were gone and turning off the music and locking the doors. I returned to talk to Chloe about her having the party. She wasn't on the same planet you could say and she didn't know who I was. I think she was on more than alcohol and the combination made her spaced out. So I decided to put her to bed and talk to her in the morning or whenever she woke up. But has I laid her on her bed she woke up a bit and started calling Phil or Bill she was hard to understand. But when she started trying to undo my pants I realised she wanted sex. At first I tried to stop her, but my cock went hard and I thought why not and let her do what she wanted and soon she was sucking my cock. This led to me fucking her and after I went downstairs and started to clean up the mess. I got rid of the rubbish and stacked the dishes in the kitchen for cleaning in the morning. Then I was going to go to bed myself, but decided to check on Chloe and found her playing with herself and decided to try and fuck her again. She was willing and I fucked twice before going to my own bed. I awoke first and put all the dishes in the dishwasher and found whatever rubbish I had missed earlier. Then I went for shower, while showering Chloe came into the bathroom totally naked and joined me in the shower and I fucked her again. She knew I had fucked before and wanted more sex. She started sleeping with me every chance she got and she is a regular sex partner for me now seven months later.