Falling For My Best Friend's Sister

Prologue:

Hi, my name is Sam and this is my story. My best friend -- whose name is Danny -- and I have been best friends for a long time now, almost forever. But, then one day he moved away. I never knew he had a sister, until a couple days later, after I had my little reunion with him. The reason why I never knew he had a sister was because he didn't really open up to people, he was real quiet, he only talked to me. But, he never told me about his family or anything about him. Danny has changed a lot since I last hung out with him and even though sometimes he annoys the crap outta of me, he's still my best buddy.

And then one day, I met his sister and I immediately fell for her. I never felt like this toward anyone before. I can't tell Danny, because he would think it's weird and totally use it against me. He may be my friend, but I've been a little hard on him lately. Anyway, I can't believe I am falling for my best friend's sister -- I know it sounds cliche, but that's just how it is.