really quick post here since I'm a little freaked and heard through the common room that a snake has been spotted. I don't wan tot seem squeamish but...I am!
And I don't know if this will be any help but back in the muggle world I once did a lot of research on lilies, mainly the mythical aspect and meaning of them and yada yada...
I did find out that snakes are actually "scared" of lilies, or at least in it's history snakes have been repelled and kept away by lilies planted in an area.
So my not so intelligent contribution to our little snake problem is to put lilies all over the common room in the hopes that it'll keep it away. Maybe we can make a spray or lotion with lily extract in it to spray near the doors as well.
I don't know, I hope something works!