I am best friends with a girl for about 4 years, we became friends in university halls, I was hosting a halls party and met her that way. The following year we were put in the same halls and became the best of friends, it was never anything sexual, just hanging out a lot, watching TV, films, playing video games and a lot drinking.
My room was at the end of the halls so she would often come in to chat and would be too lazy to move she would share my bed with me. It's all in totally innocent fun, she is quite a attractive girl so I always had to prevent myself from getting aroused.
We made a rule if the door is unlocked come in and if it's locked go away, normally if we had company. She would help me get rid of girls that would refuse to leave when a girl came over to have sex with.
After we both finished university we continued hanging out by still just as mates and would often ask what I'm up to despite now both living in our hometowns. I've been dating a few girls but they all seem to be boring and very vain, lacking in personality so I often think of my friend.
Now I realise what a great girl she is, I'm thinking of asking her out as more than friends but we haven't had sex. It's hard because Im gambling a good friendship and don't want to ruin it and don't want be awkward if I ask.
Has anyone experienced this how did over come it? Have had sex or started a relationship with a friend you known for a while? Just want advice and the right move to make.