Shouldn't picking the noodles from the sink defeating the purpose of draining them in the first place?
Not only that, but if the sink was dirty, just picking them up would be terrible. So i must assume Sakuya must keep those sinks constantly clean. Cause i know i sure as hell dont actually clean my sink unless something gunky or Oil based falls into it.
Flandre being a vampire, she problem isn't too much at risk of illness. Perhaps Sakuya know that and prefer to deal with that risk than with an unhappy Flandre.
I do appreciate how Sakuya take the time for a gentleman's break during her time stop.