It's hardly a secret that Lucy's seen Peter at... well, not his best. But that's true the other way around too. Lucy wasn't particularly charming when she got sick, for example. (And that's not the only time she's gotten a cold either. Must be the spring weather.) Honestly, it's more flattering that they've stuck together despite being kind of crap company from time to time.

"Excepting times we get turned into animals," she points out with a smile, taking his hand to follow him. Snake/bat sex would've been just wrong.