What is the summary to Chapters 13, 14, and 15 in the book The Pigman?

John and Lorraine have a party at Mr. Pignati's place
while he is at the hospital, and the party quickly gets out of hand. Everyone is drunk,
and John and some others don roller skates and dance on the dance floor they have
created by moving the furniture. Norton shows up, angry that he had not been invited,
and quickly goes upstairs to see what he can steal from Mr. Pignati. John and Norton get
into a big fight, and in the middle of this, Mr. Pignati comes home (Chapter
13).

The police come, and as Mr. Pignati declines to press
charges, John and Lorraine are taken home in a squad car. John is "hopelessly drunk"
when they arrive at Lorraine's house, and Lorraine's mother slaps her when the policeman
escorts her to the door. John's parents also react typically when he gets home,
threatening to send him to a psychiatrist, but never following through. Lorraine and
John realize that it is Mr. Pignati, and not their parents, whose forgiveness they must
earn. They call the old man the next day and offer to make amends, and agree to meet at
the zoo. At the zoo, Mr. Pignati, who is frail and weak, discovers that Bobo has died,
and he collapses from the shock. Mr. Pignati is dead (Chapter
14).

John waits with Mr. Pignati's body while Lorraine
distances herself from the situation so that she will not get into further trouble with
her mother. John reflects that, contrary to what everyone thinks, he cares deeply for
Mr. Pignati and a host of other things, and is completely bewildered at how "screwed up"
life can be. He imagines himself in his tomb, and wonders if he "would rather be dead
than to turn into the kind of grown-up people (he) knows." After an ambulance takes Mr.
Pignati's body away, John rejoins Lorraine, who is crying. Both sit for awhile, then,
in a silent, mutual realization that responsibility for their own lives lies solely with
themselves, John takes Lorraine's hand. Both understand that they had
"trespassed...and...were being punished." There is no one else to blame, and, in the
end, their lives "would be what (they) made of it - nothing more, nothing less" (Chapter
15).