My friend Simon

Анна Кабанова
I have a friend with whom I talk.
He helps with plots to splice.
Despite he likes the prose to chalk,
This joke is his advice.
He always smiles, so does he now -
Infective this, presume -
And always knows the best way how
To hide a witchcraft broom.
In languages he is well versed,
And thinks no pause is dull.
Guess, I had to say at first,
That Simon is a skull?