Emily Fields and Alison DiLaurentis were always top-notch liars, especially when it comes to hiding their feelings for one another. Despite having undeniably strong feelings for one another from sophomore year of high school, maybe even longer, a relationship isn't even in the picture for the longest time.
Nothing quite compares to what these girls share, not to mention what both of them have been through. Eventually, in the seventh season of Pretty Little Liars, this ship came true, and later on, the fandom would find them engaged, and in the future married with twin daughters. Worth the wait, TBH.