"Well, I..." Okay, right. Heiji just had to pull it together and calmly ask Snake a question about something he'd been thinking about for a while. It wasn't like it was unreasonable to ask or something (he thought...?), but maybe he could frame it in a way that would smooth things over and make it a little less embarrassing to ask about.

"...Are you a top or a bottom?" he blurted, apropos of absolutely nothing.

Nailed it.