On the day of Newt's expulsion from Hogwarts he requests that he be allowed to say goodbye to his friends. The professors are puzzled - everyone knows Newt has no friends apart from Leta - but Dumbledore agrees to accompany Newt and have him back at the appointed time.

Of course Newt's friends are all the magical creatures in the forest and particularly the lake. He take Dumbledore to where the gillyweed grows and then innocently and unselfconciously strips naked before entering the lake leaving an inappropriately aroused Dumbledore in his wake.