find someone who can finish my sentences while we're talking

At first it might be fun to find someone like that, but then he/she turns quite boring…

well, my other half is amazing to say the least. she knows everything, and i never have to say anything. a few months back, i had a letter posted on postsecret. she read it, called me and told me to read postsecret. i did. and there was my letter, and she knew it was mine. i never told anyone i sent it, but she just knew. i love her with everything i am. and well, she is in nj for college, SIX hours away, and nothing changed, i just miss her more everyday.

My soulmate and I don’t literally finish the sentence, just interrupt with a “yeah” and the first person can stop talking. It saves your breath, not to mention time.

It’s great to have a best friend.
We finish each others sentences and we say things at the same time, without being prompted.