Leaving the police station they all decide to have yet another sleepover, but then Emily leaves because she feels weird about being the Spencer/Toby third wheel. I think actually a lot of this is because she still feels like she betrayed him in this huge way that she actually didn't, like there's a conscious choosing-Spencer-over-Emily thing going on, and she deserves it, which there ... isn't, and she doesn't:
Spencer is being a pit-bull, and Toby is the most passive person in history. Whatever Spencer decides, yes it is going to be law, but the other side of that is that Spencer doesn't actually know that, because she assumes everybody's got balls and everybody has this dumptruck willpower of hers and could make things happen if they wanted. (If she didn't, it wouldn't irritate and let her down so much when people don't; this is one of the areas where I am not so proud to be coming from the same place as Spencer, because another word for all this is bully.)
Also, Hanna has to run home and do Caleb-related things, and Emily tells Spencer to call Toby about this latest fake evidence, so the "slumber party" basically just means taking Spencer to Aria's so she doesn't have to be in the Hastings house -- once Aria does some quick guess what with guess who. She tells him some shit like, "I don't know if I'm gonna end up in California, or some fishing village in Guam! It doesn't matter, we're both here now, can't we just be happy that we have that?" And he kisses her, la-di-da, and we're right back where we started.
(Except that now he's also kind of also dating her parents. Next week there'll be a scene where Mike Montgomery's like, "Mr. Fitz, I feel I'm outgrowing Noel Kahn. Perhaps you could tutor me.")
Hanna, back home: "Why are you leaving, Quileute ol' chum?"
Caleb: "Because you are being absolutely monstrous to me, and since this is your house and you basically have my life in your hands, nothing could be more awful."
Hanna: "Sorry I got all weird and rude after that one time you saw me staring at your penis. I don't know if you recall that, but they are connected. See, I wasn't..."
Caleb, verbatim: "...Ready to see that much of me?"
Hanna: "Gnarf. Speeble. Zamfratz."
Caleb, verbatim: "And now you think you have to throw down too?" (...What?)
Hanna: "Schplatz. Flirzl."
Caleb: "Um, whatever you want. It's totally fine if you want to make out, 'throw down,' not make out, not 'throw down,' let me stay here, not let me stay here. I've made it pretty clear that I adore you and I'm not going to push you in any way."
Hanna: "Too much right words. Too much good talking, thanks. Lucky good talk."
Caleb: "But on the other hand, are you like blind? I have been this cute this entire time, especially once you ruined my beanie."
Hanna: "Um..." (Much kissing. Finally. Because is she like blind?)