Bruce/Tony
"Why would I try it?" Tony countered. "I can just buy it from people who already do it professionally. It's way easier." Also, Jarvis wouldn't yell at him for setting the kitchen on fire that way. Win-win. "Anyway, what's with all this skepticism? The lady selling them called them tarts. We're not writing a dissertation, here." Tony wasn't really arguing so much as teasing, and if Bruce really knew him like he said he did, maybe he'd think it obvious.
He finished off the donut, sucking the cinnamon sugar from his fingers with zero sense of shame. "I don't remember bringing my sexual preferences up at all," he said, glib.