She's never pushed him, nor tested the limits of the chassis protocols - but some days, buttons are not the only things needing to be pushed, and portal devices are not the only things needing to be tested. Some days, like today, the test subject needs to become the tester to push his system to its limit - for science, of course. Wheatley/Chell, testing/solution euphoria denial

Meteors, signals, apologies, and that tricky little thing called humanity- four years after the events of Portal II, Wheatley's been handed a second chance, but it's not going to be plain sailing…