<human>: Can you provide a brief rundown of the text in within 3 sentences?

I want to start this off by saying that my girlfriend and i have been together nearly two years and I couldn't imagine myself with anyone else - she's wonderful.

However, we do live quite far away and often go weeks on end without seeing each other.

It's normally when we've been apart for a long time that I feel most attracted to my sister. The attraction has definitely grown recently as she's got curvier and more womanly, but often also makes me feel sick for having these feelings. She's also now wearing more revealing/sexy clothing, which has an effect as well.

Obviously there's no way anything can ever happen with my and my sister, even if I were single, so how do I deal with these feelings and get over them? Am I super-creepy for being attracted to her in the first place? Should I tell my girlfriend or will it just hurt her feelings?
<bot>: In love with my girlfriend, but find myself increasingly turned on by sister as she gets older. How can I stop myself feeling this way