Ruin the mood? Not even close. Alistair's well aware of how charming Zevran is, and it was for that very reason he saw the elf as a romantic rival.
His ears are reddening again.
"As a matter of fact, he hasn't," he says, lifting himself to his feet. "So, shall we go then? Once we find the Portkey, it's only a few blocks to my flat."