<human>: Give me the gist of the text in a nutshell

I am a 41 y.o. Male, who used to be married (lost wife of 17 years to cancer 2 years ago).  For the past 3 years, I've been cycling with two women (35/33) who are sisters.  We were always close friends, but now I'm wondering if there could be something more.

Here's the tough part ... one of the two (let's call her Brandy) is really into me, but I'm more into the other sister (who I'll call Amy).  Both are beautiful and funny, and leagues above any other woman I've known since meeting my wife.  I could imagine being happy with either.  

Since they are sisters though, if I express my interests to one it will kill my chances with the other ... who wants to be the second choice?  This means if I ask out Amy, which is what I really want to do, then if she says No I'll lose my chance with Brandy.  If I ask out Brandy, we'll have a great time, but part of me may wonder what it would have been like with Amy.
<bot>: want a relationship with one sister who may not like me, but her sister (who is still awesome) wants a relationship with me.  Not sure what to do.