The warning signs start to have pictures of cake on them.

At the end of the final test chamber he rounds a corner to see - a room full of fire. The platform moves slowly toward it.

"Congratulations! The test is now over. All Aperture Science testing equipment remains safely operational at temperatures up to 4,000 degrees Kelvin. There is no danger of equipment malfunction before the completion of your victory candesence. Thank you for participating in this Aperture Science computer aided enrichment activity."

"...Yuuup, there it is. Think fast, Sadde!"

"Not that fast," he says, grinning, and—" Portal on the wall, portal on the far wall, jump through..."

"And now you have seen the true face of Aperture Science. Whatever shall you do now?"

"Maybe I could assume the 'party escort submission position'," he says dryly. "Or I could go to that hidden portalable place over there—this game is a lot of fun—" He pauses, then grins at Terry. "And I've been here for a rather long time," he adds sheepishly.

"-You have! Uh, is that a problem? Go if- You can go if you wish to, of course?"

"It's not a problem to me," he says quickly. "But I am in your room using your computer and having fun while preventing you from it, so..."

"Oh! Don't mind me. I'm making good progress on my memory in between being amused at you reacting to GLADoS."

"Not minding, then," he says, grinning, and onwards.

The game does not last for too much longer. The dramatic confrontation with GLADoS's main body is a very tense scene and Terry actually stops working on magic in his head to watch Sadde's expressions.

(He doesn't really realize he's doing this but...)

Sadde's expressions are mostly frustrated amusement mixed with unalloyed glee whenever he lands a hit and GLaDOS has a new quip. He finds the bit where the closed captions say her voice turns "sexier" particularly hilarious.

"This is not how AI works at all, of course. But it's a game."

"So it is," he agrees.

And then he beats GLaDOS and literally whoops out loud.

"That was loads of fun," he says, grinning. "Thanks for inviting me."

"You're welcome! It was fun, showing off the wonder of video games! I can try to find something less single-player later."

"It would be lots of fun playing with you." And surprisingly enough there is absolutely zero innuendo.

"I bet it will! I'm a fan of board games too. Those take a while and are more like a four or five player thing. I'm gonna try to find or start a group for it."

"I'll try to find people for that, too. But uh now it is pretty late and I probably should go."

Oh look the return of the awkward.

"...Yeah. Have, uh, a nice day."

"Night, more like," he says brightly. "I'll probably grab something to eat in the cafeteria first."

"-Oh, right, they're still serving dinner probably." He should probably eat too but he just spent hours alone with a sub so, uh, no.

"Yeah. I'll get out of your hair," he says, noticing the hesitation and lowering his head a fraction. "See you later."

He almost says 'Have a good night' but changes it to "Yeah, see you later."

Off he goes.

A couple of days later he goes looking for Terry again.

Terry is attacking math homework in the library. Holding stock still for a couple of seconds then angrily scribbling an answer, and repeat.

That's adorable. He waits for the next time he looks interruptible.