Full conversation:

*Demon appears*
Sayaka: Eh...hello?
Demon: You could be a demon! An amazing demon!
Sayaka : No,no...Angels and demons dont exist!
Demon: Haha. But you can see me. And you saw this little fairy too. Magic DOES exist.
*smiles* C`mon! Demon magic is so much stronger than angel magic.

*Yusaki appears*
Yusaki: NO! SAYAKA!
Sayaka: Ahh! I see this fairy again. Magic doesnt exist! NO NO NO NO! Stop!
*wants to leave*
Yusaki: Wait!
Sayaka: what?! -.-*
btw it´s a little story. .u. :3