Let's continue to use dark_blade as an example... I often refer to people as mine. "My Rin." Or m0usegrrl - "my Mouse".
Because they are my sweeties, you see.
Regarding the use of "I love you" - it's platonic love unless stated otherwise. I love Rin. I love Mouse. Not in any romantic or even sexual way. I just love 'em, and I am wont to hug them and say that.
More 'song etymology - "cupcake". If I call someone a cupcake, that means that I find them adorable and want to take them home and feed them cookies. So don't be surprised if you're a friend of mine and I greet you on the phone with, "Hey, cupcake!" It's a good thing.
I am extremely verbally affectionate.
That is all. I think.