Ok, I went to give it a read, and right at the first paragraph was seeming a little on the odd side for me.
"I wanted to become a politician. I liked manipulating, scheming, blackmailing, and was eager to put it all into action. If possible, helping people."
Aside from some problems in grammar, the phrasing just seems off. It's very concise and very matter-of-fact. I think it could be done in such a way as to emphasize that there's a person there. In this case, it might help to expand on the characterization of a person who gets pleasure from manipulating people to ends they don't necessarily care for. It doesn't have to be as blatant as, say, "Dance for me, little puppets, dance!" but that little three sentence mission statement falls a bit flat.
The next bit, about location affecting it, that I like.
"Here, however, I needed their money for college. They were too rich for me to get any financial aid, and wanted me to become a computer engineer."
This was a complete disconnect for me. I normally get the sense that someone well off enough to afford college without financial aid at all isn't the sort whose parents want them to be studying computer stuff. Personally, it strikes me as more of the types to push for a medical, law, or business degree.
That doesn't mean your story isn't wrong because of my bias. It just means that if a bias is widespread enough, you may have to go out of your way to explain why it is that they are like this.
Next paragraph: holy shit, a college with a nuclear reactor? Interesting revelation. Dropping it so casually may help to indicate an alternate universe.
I think you could try a little more to write the next few paragraphs, which aren't bad at setting up the scenario, in such a way as to emphasize (in a way that hints at the narrator being slightly unreliable) that the real motivation is to avoid doing the difficult work necessary.
As in, maybe if she pushed herself really, really hard and stayed up late... or she could join someone else's project, put in a perfectly reasonable amount of work, and get a passing grade that way with no harm to anyone's education or grades.
After this, when she's more in her element, you use language in her narration that works well to show her character.
That is more what I think you should do as far as fleshing her out in her narration. Plus, his revamping helps show how if Alexis cared enough, she could get it done in a short amount of time.
As Maddi mentioned, Eric is way too calm about a girl walking into the men's bathroom, yanking aside the curtain, and snapping a nude photo on her phone. No slipping on a tile floor and dropping a loofah from a sudsy hand. No yelling out, "The fuck?!" Just calmly, quietly, grab the phone, delete it, hand it to the girl, and don't talk about it at all until the shower is finished.
Not even a "He glared at me and acted like he was going to hand the phone over. When I reached for it, though, he pulled it away and instead set it on a shelf on the shower surround. He pulled the curtain mostly closed. 'I'll hold onto this until I'm done. Then we'll talk, if you want it back."
Considering that she waits in the hall just to tell him to go somewhere else in a set amount of time, couldn't she just have told him all that in the bathroom and left to wait?
Though I will say that "Yes, I knew how to break all modern encryption. I could read or fake any message, hack any site, rob any bank, control any government. And that was frightening as heck." goes toward showing why Eric wouldn't cuss with a girl invading his shower space. Still could have him let out something like "What the hasenpfeffer?!" back at the shower.
Eric's characterization seems pretty good so far. I got more of a mad scientist vibe, but either way he comes across as smart and somewhat formal. Considering he attended school in Germany, being more formal while communicating in English isn't unheard of.
Problem was, the end, to reiterate what Maddi said.
"Wait, if I told her what my project is about, she was smart enough not to involve herself any further.
Fully aware that I was probably making the biggest mistake in my life, I gave her a nod."
I get that you're going for something of a cliffhanger here, but this is one where we could stand to learn more about his reasoning for why he's doing what he's doing. He doesn't want her involved, and can get the picture easily, but he also somehow thinks she has special blackmail skills that can help him, but yet he also feels that having her help him is the biggest mistake of his life. It's odd.
Also, I'll be dropping off a comment full of typos in a few minutes.