M
As you add power the aircraft will accelerate (speed) as it accelerates the increase in airflow will cause lift as simple as that. The primary action of adding power to a trimmed aircraft in level flight has to be an acceleration and hence increased airflow over the wing.... as simple as that.
If you displace a correctly trimmed convential aircraft from its speed then release the controls it will return to its trimmed speed after a few phugoid excursions without any control inputs
What the heck has that got to do with it try doing that and at the same time shove in a fistful of throttle and see what happens?
Pace