Angelus hadn't really stopped to think about how he'd gotten control of his body back. He shared Angel's memories, so he knew it hadn't been brought on by a sexual encounter, although he'd tried to convince Buffy that it was. In fact, it hadn't been perfect happiness at all, or even an illusion of it. If anything, it had been perfect terror. He had to assume magic played a role, but not the kind that had been used on him in LA a few years ago. It felt different. Angel was still in there, closer than usual. Like he could get control back if he just tried hard enough. Which would have freaked Angelus out if he thought the guy was strong enough to manage that.
Although, being around Buffy might've been a mistake, because Angel definitely wanted control of his body back now. He was boiling up inside, but Angelus pushed him back down.
"Oh, no, I got that. Your signals were pretty clear." He stepped inside the apartment, but didn't advance any further on Buffy. He wasn't really here to hurt her, anyway, at least not physically. The emotional damage was far more satisfying.
"Any luck finding Glinda the Good Witch? Or are you still too busy trying to figure out how Angel misplaced his soul to begin with? Hey, I barely get the rules anymore either. Last time you two lovebirds got it on, I wasn't even allowed out of my cage. And I know for a fact he was happy enough. Does that seem fair to you? Twilight got to have all my fun. Oh, but I guess Angel hasn't told you about that yet, huh?"