I Want To KISS My BESTFRIEND(same sex) !!!!!?

Well right now my bff is sleeping over at my house ( were both 13 and girls ) Im bisexual and my bff is totally and completely straight !! I want to kiss her and this would be both of our first kisses( she had a fake 1 in 3rd grade ) and I took some ther advice and tried to bring up the kissing topic but the conversation never held :( when we went to bed we were talking and I told her I was bi. She said " your not bi your just confused " and I thought for a couple mins and then I was gonna ask her to kiss me and she was asleep -_- So I think she might be spending another night which would give me mire time but what if it changes our relationship ? Last night she also gave me playful kisses on te cheeks :) she also said " even if you are bi your not gonna try going out with me " and I agree. I just wanna kiss her ! Please HELP and plz no answers like " don't do it " if u say that plz explain and HELP ME !!!!!