My sisters Ass

My sister Jackie 26 is very shy and doesn't date at all, on finishing her courses at university. She got a job in the city and lives with me, I work as a plumber and never went to university. I don't date much at all as I'm buying my own house and would rather pay it off first. I'm Earnest 28 only sibling of Jackie, our parents live in the same town as we were born and never plan to leave. They visit us or we visit them, anyway last Christmas we had visited our parents and were on our way back to the city and a bad snow storm started. Our radio said it would take about 24 hours to blow thru, so we got a room at a motel. We only had another 50 or so miles, but decided to let the storm pass us by and wait it out in a warm motel room. We settled in watching television and had dinner at the local and back to our room to watch more television. But the power went off and we were in the dark. I said it will be cold without the power and so we decided to share the same bed. During the night I got horny and with Jackie beside made it to dismiss it from my mind. Finally I cuddled up to and she cuddled back into me, then I got a hard-on and it was poking her ass. She reached around and felt my hard cock and asked why I was hard. I said I was horny, she said you can't fuck me I'm your sister and I'll get pregnant I'm not on anything. I was a little shocked that she thought I was going to fuck her, but decided to tease her a little bit. I said I've no condoms so I'll have to fuck your ass then. Waiting for her shock reply, before I was going to say just teasing. I was the one shocked however when she said okay only ass then you promise. I recovered and said okay, I told her to remove her panties and she did. Knowing she was still a virgin I decide to take my time and get her off before fucking her ass. Having licked her out and had her moaning, I cracked her ass and left my cum inside her, after which we went to sleep together. In the morning the storm had passed and the power was on and we showered together, then I fucked her ass again and then we showered again and had breakfast and continued back back to our home. Jackie was upset or anything that I had fucked her ass, so I asked her would she like to share my bed now and she just nodded and we been sleeping together ever since. Recently I've got the urge to take her virginity, but haven't asked her yet.