Bianca & Ernie
Ernie knew what it was to feel at least some sense of...modesty...around the cupcakes that Bianca made, as he himself had just a bit of difficulty with them. You would think that after years of being under the influence of Justin Finch-Fletchley one would develop some sort of immunity to things like this, but Ernie appeared to be somewhat resistant to most of Justin's influences.
Justin would've had to work hard to undo the influence of the very prudish standards of the pure-blooded Macmillans after all, which would likely take double the time to accomplish. (Yes, give it a few more years, Justin.) There had been slow and steady progress though, Ern would grant Justin that, at least. For example, Zacharias Smith was quite wrong about Ernie being "virgin boy"--he just wasn't one to broadcast his sex life or overtly and endlessly pursue what he needed.
"Thanks for bringing in dessert," Ernie said to Bianca with a confident smile (he was good at faking confidence at the very least, for the most part). "I know that Justin certainly appreciates them." He was waiting for the moment that Justin would offer him one...just since he knew that he himself would have trouble not being beet red too.