Look. Everyone in fanfic seems to come on command like frickin experts. Which is great, but what if Noctis is TERRIBLE at self control, like he comes early and often and cries a lot and is just a mess, a wonderful mess, but sex is always over really quick because no one believes him when he's telling them to keep going through ugly sobs.
Ardyn/Noctis, Orgasm control
So Ardyn helps him out with that.