It was night and Remus Lupin was walking around the Black lake at Hogwarts, just to chill around after finishing his homework, he kept walking around it until he saw someone on a large rock in the lake.

Like a Siren, because this person have a siren tail, He walks closer and notices a siren! in the Black lake on a rock, in the moonlight.

His eyes widen as he keep staring in disbelief, not believing that in Hogwarts there is siren! He was sure gonna talk to Sirius Black, James Potter and Peter Pettigrew that he saw a siren.