César is doing his best to ignore how nice that voice is because there's more important things to discuss. And César doesn't even realize he's under the affects of that "love potion", which affects what he says next.

"... oh. Well, ah, is there some way I can contribute?" His coat looks dirty from helping with outside construction, and his cheeks are rosy from the code. "I just want to become productive as soon as possible, considering I came here at the worst time. I don't want to just be another mouth to feed."

Yes. He literally just said all that with his own mouth. Cheerfully! When he at most showed up two days ago.