Karen watches his memories, his thoughts, his retelling, first with confusion, still feeling a bit like she was in a dream, and then a shock of, well, horror, making her fully alert. There's a difference between being wired differently and having a bad upbringing and... and someone who could do something like that. Her vision of Sean shifts from someone a little out of place and different and not given the proper space to flourish into something else. Something much much worse.
But still. His memories, even if they're filled with such a horrifying thrill, a disgusting twist of power and joy and arousal all twisted together in a way that makes Karen shudder to feel secondhand, they are, as he notices, filled with such regret, clearly he does not like what he's done and wants to change. He can't ever be forgiven for what he's done. But maybe he can grow, which was the whole original point. Even if it's not quite growing in the direction she expected.
Karen winces, seeing the way he saw her through his eyes, at first. She understands why, from his perspective, she was almost immediately dismissed as potential prey, the line of reasoning why it would be essentially dishonest to help her out and then take her back to his car afterwards. It makes perfect sense, from his point of view -- but even with that tempering it, it still makes her twitch, noting that the only thing between him seeing her as potential prey, as something he could take and convince into her car and use for his own twisted pleasure was the circumstances in which he saw her. She's glad that he hardly thought her about that way at all, she's not sure she could have stood it, watching him look at her the way so many other boys did, yet another person she thought was her friend throwing that aside because they found her pretty, and feeling it through his eyes. She's so very glad that the small fleeting thoughts were merely small and fleeting, that he never really thought about it again afterwards, that thinking about it now is painful. But the fact that it was merely chance and luck that made him treat her as a person and not an object, something to fool and win, regardless of whether or not he was treating everyone that way besides her -- it still stings, and stirs up bad memories and experiences that have haunted her for so long. This, unlike many of the other things he's done, is something she can likely forgive -- but it still hurts that someone she's been caring for and helping could have, if things had been slightly different, looked at her and treated her that way. She can feel what bits of friendship and care she has left after his earlier revelations shrivel up some more.
She is rather glad how he helped her out, though -- even if his reasons for it were a bit sour as well -- he still lined her up as someone he could convince to be his, whatever that would mean, even if it would be done in a nicer way. Still, it's oddly gratifying to see how his opinion of her grew during that conversation, caring about who she was as a person and putting any ulterior motives aside. And getting rid of those two boys... well, she was in a bit of a funk, her hopes being dashed, and Sean had helped. A lot. She was doing a lot better with people now than she would have, thanks to him, no matter what his motives were.
Watching Valerie get taken down a peg, or two, or more, well... Karen hated those kinds of girls in high school. Despised. And Valerie is some kind of messed up epitome of all the horrible sorts of things those girls used to do, taken up to 11. She's not so sure she deserves what Sean has done to her but... well, no, she can agree that she deserves it. Especially with what she thinks and said about her, the stuck up bitch. And the fact that he says, and means that Karen is worth ten of her, well. That helps to repair some of the damaged positive feelings she has towards him. Some. It doesn't make up for the fact that he went around doing awful things to people without compunction even if he could get away with it. But besides that, even if he didn't start out thinking she was particularly important, he certainly did so then. And probably more so now.
The thing about the magic tattoo and feelings is interesting, she supposes, as to the conditions it creates and what it takes it to make it happen, but she's not quite so sure why he's pissed about it. Yet.
The stuff about Jenna seems important, clearly something happened related to that, the memory is tinged with it even if she doesn't have perspective on it. Continuing to stalk the poor girl is pretty horrible, but they'll get to that in a bit, most likely. At least that's the implication from the memory.
And then. It's one thing to have it described to her in words. It's another thing to see it the way Sean saw it, understanding and seeing what had been done to that poor girl. It's revolting, disgusting, degrading, terrible and awful. She flinches away from it, the shape of what was done to her. Someone or something horrible did that, took a person and tore her up and made her into something... she shudders.
And then she understands why he's so angry about how taking ownership of someone works. And at least part of why he's in such pain at the moment. What he did was noble, forcing himself to do something neither of them wanted to do like that, but obviously traumatic. Obviously obviously traumatic. She does not like what he's been doing, is worried and terrified and disturbed by it, has no good reason to treat someone like that as a friend anymore no matter how he's been treating her, but she is (was?) friends with him. And even if she wasn't, it's hard not to pity him for this. Being forced to do something like that to save someone like that would hurt anyone with a spark of empathy and soul in them. And it clearly hurt him more than he realizes.
Karen gives him a look when he takes a breath. There's plenty of pity and empathy in it, from what she's just seen and felt him go through, but she remembers that he's been doing awful disgraceful things to people without their consent, and taking twisted pleasure from it, and she tempers her look it a bit of disdain. She's seen so much and maybe she'll feel better about things when she's thought about it, and maybe the end of this story will help redeem him, though she's not sure how, but right now she's horrified and scared of what he is and what he's done, whether they're friends or not, and overwhelmed by everything she's seen. "I assume there's more, besides this," she says, urging him on.