I"m currently dating my sister's best friend. We started messin around and stuff and that went on for a while, my sister was iffy about it but she was more mad that we just didnt go out and get it over with, so now we are, and have been for 3 months, and its going cool. Plus we already discussed that we are gonna try and stay friends if we end it because no matter waht we have to see eachother still if we break up through my sister, so yea its all good.