Is it normal to want a friend

So im a bisexual chick and i often find my self really wanting to make out with my best friend (also a chick and bisexual) and maybe even fuck with her but usually if we're hanging out ill just start wondering if we could just start going at it. we're both submissive but id still really like to get with her. and i think she has a thing for me. we have really different body types although we are around the same height (shes 5'2" and im 5'3") shes really skinny, small chested and not really curvy whilst im a bit chubby and hourglassed with a d cup and prominent hips. is it odd?