You know.. Not all pretty people are into other pretty people too..
Owen's personality is more introverted and totally reserved. Owen is too cautious with other people especially he is a CEO of a huge pharma company. Nick just attacked him with full sincerity, maturity and him being really a reliable person. Like in the early chapters, his confident aura and reliability when crisis comes makes even the reserved one slowly drapes down their defenses. That is maybe what Owen got from Nick.

by far the ugliest alpha in the omegaverse