The point of his arc is that he's just gay. He really wants to fuck Okabe. Okabe is straight. He would become a woman to have a shot with Okabe. Ultimately the two work out their issues and Okabe says that Lukako is such a cute twink he doesn't care, he'd tap that. The issue is, his true love is Kurisu. Lukako is very sad, he's one of the few characters who has a bad ending in the "best" worldline.