Light at the End of the Tunnel.
For a while, Angel thought everything was all right.
Then he noticed Wesley acting... odd. Nothing that he could quite put his finger on, and he couldn't figure out what, exactly, about Wesley's behavior was odd, but he knew that something was up.
So one day, he followed Wesley. Just to find out what was going on, because he didn't want Wesley to get into something that could possibly be dangerous for all of them. And yeah, he knew that he was lying to himself, and he didn't care.
To his shock, he saw Wesley go into a demon brothel and stay in there for hours. When he came out he was reeking of sex, and Angel, stunned, barely had the presence of mind to follow him home.
Wesley still lived in the same apartment, and Angel realized that he hadn't been here since... since before Connor, actually. Probably much longer than that, to tell the truth. When had he and Wes lost the friendship that had once been so close?
He shadowed Wes up the stairs and dithered just long enough about following him in that Wesley shut the door before he made his mind. But when he tested the door, he found it unlocked, and when he turned the knob and tried to go in, he found that he had never been deinvited. Even after Angel had tried to kill him, over a year ago now, Wesley had never barred Angel from his home. Angel couldn't decide whether that was an indication of Wesley's trust, or of a death wish.
He quietly shut the door behind him, and followed Wesley's scent into the bedroom. He stood silently in the doorway, watching as Wesley peeled clothing from his body and tossed them with casual accuracy towards the open laundry hamper. He was unable to repress a slight gasp, however, when he saw the marks on Wesley's body, most of which were obviously not human in origin.
Wesley spun around at the noise, and his pale eyes widened when he saw Angel standing there. But then he deliberately relaxed his body, making no motion to cover himself, and tilted his head inquiringly.
"Angel, is something wrong?"
Angel shook his head disbelievingly. "Hell, yes, something's wrong. Wesley, you went to a demon brothel tonight. Why? I didn't think you went in for that sort of thing."
"There's many things you don't know about me, Angel," Wesley said, but his body looked a lot tenser now. Easy to see, since he was standing there nude.
Then the rest of what Angel said clicked, and Wesley's eyes narrowed into a glare. "You were following me."
"Yeah. Thought something was up, and found out that I couldn't be more right. What the hell is going on?"
"You tell me."
Wesley's words fell between them like stones dropped into the still surface of a pond. The ripples spread between them, and Angel couldn't control a flinch, suddenly filled with a horrible suspicion as to what, exactly, was wrong with Wesley.
"What do you mean?"
"I mean," Wesley said, anger snapping in every word, "that there's something wrong with me, Angel. Something missing. And I'm starting to think that it's something to do with you."
Pause.
Angel has a single moment in which to make his decision. He can play it off, tell Wesley that he's been working to hard, or even suggest that he visit a doctor. Or, he can tell the truth.
He closes the distance between them in one fast move, and has Wesley in his arms before the man can even realize what's happening. The kiss is hot, rough, fast, and wet, and it sends Angel spiraling to the edge of his control. But then he pulls back, noting the slightly dazed look of pleasure on Wesley's face, and pulls the unresisting man over to the bed with one hand.
"Wes? You might want to sit down. There's something I have to tell you..."