Secondary gender doesn’t come up much between you. On the rare instance that it does, it's to criticize the system built around it.
The whole thing just never mattered, you didn't act omega-like, and tradition far from suited either of you. So, did it bother Simon how disconnected you are from your omega instincts? No, not at all. He'd love you the same if you weren't an omega at all. You were his best friend. Maybe a lot more than that, though that's never something Simon would act on without some explicit sign from you that you feel it, too. More than that, that you want it.
What is starting to bother him is the idea of you not having support.
The two of you have never talked about your heat. Which is fine, he doesn't need to, but it's obvious you're not getting any form of relief with how irritable you've been lately. Not to mention your scent glands are nearly always covered.
Simon has never asked about it, though it always sort of lives in the back of his mind that he's never really seen to relax around anyone. Around him. He's entertained the thought that maybe you already had a heat partner, and as much as the idea makes that part of him that he keeps locked away vex, it would be better than you having no support at all.
Simon doesn't know what the hell comes over him to ask now, after months of convincing himself it was better not to push. You'd been pissy lately, sure, which is a sign your heat might be approaching but Simon has known you for years. He's seen you irritable, he's seen you wrecked, pent up, angry. Simon didn't run his mouth then; doesn't know why he decides to do it now.
"You know, I could help with your heat," Simon spoke up, his own voice surprising even himself. The words weren't spoken in any tone of voice that was unusual for him, but now that he'd opened that can of worms, he makes a point to get his entire demeanor to become gentler. The last thing he wants is for it to come off as him trying to be all controlling about something that was, in the end, your call. A call he would respect above everything else.
He clears his throat, eyes moving over to you to gouge your reaction to his words. It was in the early hours of the morning; in the quiet hours where the two of you had made a habit of hanging out within. Without all the noise. It's something he knows he'll miss when the two of you inevitably split ways hopefully far off in the future.
Simon keeps his scent calm as he continues, hoping to soothe any tension he just added to your figure. "Assumed it might be comin' up, thought I'd offer."