Faith, Hope, and Trick.

When Buffy first sees Faith, she is rendered speechless. Faith is something new to her, a little bit of rye tossed into the white bread of Buffy's life. It's love at first sight, though she may not admit it yet. Faith is equally enamored, flirting heavily(hungry and horny comment)
Later, she asks Buffy's friends about her(a classic move on the part of an interested party) When she asks if Buffy "needs to find the fun a little?", she is quite clearly offering to help Buffy find a little fun with Faith herself.
When Buffy sees Faith and Scott talking, she is jealous-but of Scott, not Faith. She is afraid Scott will steal the other Slayer away before Buffy can explore her feelings for her. She wants Faith all to herself.

Beauty and the Beasts

In this episode, Faith makes it pretty clear that she has a low opinion of men in general and she tries valiantly to get Buffy to switch over to her viewpoint of the male species. This is because Faith does not want Buffy to love any man, she wants Buffy to love HER. More specifically, she does not want Buffy to like Scott, who they had been discussing. A specific denunciation of Scott himself would have been suspicious, so Faith condemns all men.

Homecoming

Ok, Faith asks Buffy to the Homecoming dance-I think that's pretty direct. Her girl has been stood up, and Faith is more than willing to step in, pilfered corsage in hand.
And when she sees the full extent of Scott's churlishness(i.e. bringing a date when he said he wasn't) she avenges her beloved with a well-placed STD allusion. A Slayer has to watch out for her girl.

Revelations

All right. In this episode, the gang is dicussing how Buffy must have a secret boyfriend, when along strolls Buffy and Faith. Buffy says that, yes, she *is* seeing someone that night. Faith drapes her arm around Buffy and in a tone meant to convey exactly the opposite says, "really, we're just good friends." Playful joking? Perhaps. Or is it the Slayers' way of tentatively introducing the gang to their romance?
Later in the ep, when this romance is threatened by the discovery of Angel, Faith becomes insanely jealous and goes after the vampire, wanting to eliminate her competition. when Buffy comes to stop Faith, it is because she doesn't want Faith's jealousy to kill an innocent man. The sexual tension in this fight was amazing. They wanted to just jump right into bed with each other.
Also during this ep, Faith and Buffy compare past boyfriends. It is obvious that neither of the Slayers has had a decent relationship, and this is because they are destined to be together.

Gingerbread

When Buffy talks about the story of the little boy who got his finger caught in the duck, Angel gently corrects her, telling her it is a "dike". Buffy is upset, thinking Angel has guessed that she is having less than sisterly feelings towards Faith. If she wasn't, she wouldn't have been so shocked by Angel's observation.

The Zeppo

All right, Faith has sex with Xander. Note that I have never said that Faith is strictly a lesbian-she could be bisexual. She was simply horny, and the one she usually shares her lust with-Buffy-wasn't there. It's obvious Faith doesn't place any importance on this liasion, and neither will we.

Bad Girls

Where can we start? The obvious flirting? The heart on the window? The banter between the two? The DANCING?! This ep was one big ball of Faith/Buffy homoerotic content, cut short by an unfortunate accident.

Consequences

Buffy spent this ENTIRE episode trying to help Faith. Why? Because she loves her, and she wants to help her. Buffy ALSO tried to keep Faith from being sent away, first to prison, then to the Watcher's Council in England. And why did she do this? Because she loves Faith and couldn't bear to be apart from her.
I know, you're all wondering why Faith would want to leave Sunnydale, since she loves Buffy so much. She was afraid that after she freaked out and accused Buffy of murder, Buffy wouldn't love her anymore. She didn't want to see the pain she caused the one she loved, so she decided to get out of town before she hurt her love any more than she already had. And when Buffy came after her, Faith was still so insecure that she thought she had to become evil. Poor Faith.

So this is the ep where we find out about Faith's evilness. And this is the ep where we also find out that Faith is definitely still feeling something for Buffy, even if she is evil now. Eeverything Faith does in this episode is designed to hurt Buffy; stealing her boyfriend, torturing her, etc. etc. Faith still can't get Buffy out of her mind. She hates her simply because she loves her.
On Buffy's part, she is horrified by Faith's betrayal and so tries to forget about her feelings. But whether she was acting or not, her speech to Faith when she was tied up: "But we were friends, Faith." speaks yards about her feelings of hurt and betrayal. A low point in the girls' relationship, but sexual tension abounded, i.e. "If you're a screamer..."

Faith loved that knife. It was the nicest thing anyone had ever given her. She loved that knife more than anything. However, at the end of the episode, Faith gives up her knife to save Wesley. She didn't have to, but she saved Wesley to make Buffy happy. Also, Buffy said that she was staying in Sunnydale because Faith was no longer fighting evil for them. That's not true. She's really staying in Sunnydale to be near Faith.
The Mayor said, " (to Buffy) So, you're the little girl who has been causing me all this trouble. (to Angel) She's pretty Angel. A little skinny. (to Buffy) I still don't understand why it couldn't work out with you and my Faith. I guess you just kinda have strange tastes in women." Now... Angel responded, but he just didn't realize that the Mayor was talking to Buffy, not him. Because even the Mayor knew that Faith loves Buffy, and he felt that the two of them could work out their problems.

OK, I think it's pretty obvious that Faith and Buffy are in love in this one. Faith comes back *from the land of the coma* to help Buffy defeat a man she loved like a father. And although Buffy killed her, Faith smiles, jokes, and laughs with her. Wow, she's forgiving.
And when Buffy wakes up from their shared dream, she goes into Faith's room and smooches her. I don't know about you, but that looks like love to me.

Ok, where to start. To begin with, throughout her entire coma, Faith has been dreaming of who? Buffy. Buffy has invaded even her subconscious. In the first dream, they're making up a bed in a room that they seemingly share(so they must share the bed too.) And even though she has to go, Buffy really wants to stay.
After Faith wakes up and is walking out of the hospital, we hear Buffy say, "I never stopped thinking about you." Now, she's supposedly saying this to Riley, but we hear it as an image of Faith is walking. Bad editing? I don't think so. Faith is first and foremost in Buffy's mind. She's her "responsibility." Even Riley knows it. When Buffy tells him about Faith, he says she's holding something back on him. It's always awkward to tell your current honey about former girlfriends.
In addition, Buffy is tops in Faith's mind as well. Faith immediately goes to find her and sees her snuggling with Riley and looks *really* jealous and upset. When she finally meets up with Buffy, she lets her girl have it. She's angry and upset that Buffy couldn't leave Angel for her, but could leave him for Riley. Still, she wants Buffy just as badly as always..."Let's see who ends up on top."
In addition, when she's talking to Joyce, she alludes to the fact that both of them have been "dumped." It's too bad that Faith is a little irrational after getting out of the coma or maybe the Slayers could have worked things out.

Faith wants Buffy *so* much that she switches bodies with her and what's the first thing she does? She takes a bath and gropes herself. It's right there onscreen! If they showed us that, just think what they *didn't* show us. Then, Faith tries to show Buffy's body a good time, taking it out to do all the fun things that Faith tried to talk Buffy herself into doing. Meanwhile, Buffy is learning what's it like to be Faith, getting an idea of what her girlfriend had to go through.
When Faith sleeps with Riley, she gets very upset when he says, "I love you." Faith has always heard those words as some sort of trap, a way for people to get her into bed. Or maybe she heard them from abusive parents. She asks Riley, "What do you want from...her?" Even now, she is looking out for Buffy. She doesn't want anyone to hurt Buffy because she loves her.
She herself can not hurt Buffy that much, so she does not run away again, but instead comes to the rescue at the church. She's obviously very mad at herself and what she thinks she's become because she beats herself up. She was not calling Buffy a murderous bitch, she was calling herself that. When they switched back bodies, the girls could only stare at each other in shock because of the knowledge they'd gained of each other. This bodes well for reconciliation if Faith ever comes back. :)
Finally, Buffy is very upset when she hears that Riley slept with Faith. Not because she's jealous of Faith, but because she's jealous of *Riley* for moving in on her territory. And what are the Slayers thinking about at the end of the ep? Each other.