"Bus driver" joke

Once there was a nun that rode the bus every night precisely at 8:30pm. she rode the same bus with the same bus driver.And every night she would get off the bus at the same place. Well, one night there was this guy who got on the bus. He noticed this nun sitting there.He started thinking to himself,"
man that nun is really hot!"
And every night for a week he rode the same bus at the same time and he would see this nun.After a week he was really horny because of this nun. So one night after the nun got off the bus he went up to the bus driver. "
man that nun is hot. I would love to get a piece of ass from her, but I don't know how to go about doing it.She's a nun. Do you have any Ideas?"
the man said. The bus driver thought for a moment and said "
actually yes I do. That nun gets off at the same stop every night and then walks to the cemetary and visits the grave of her mother. If you dressed up and pretended to be God she would do anything you say."
The man says "
ok, thanx I'll try it."
So the man goes and buys a God costume and goes to the cemetary and waits for the nun to show up.And sure enough the nun showed up.She went to her mother's grave and knelt down and prayed.The man, who was hiding behind a large headstone, jumps out and says "
rise, sister, for I am God."
the nun, frightened by the man, swears. The man says "
sister, you swear in my presense. What shall we do about this?"
The says I'll do whatever you want.Please forgive me."
The man says "
well if you have sex with me I'll forgive you."
The nun agree's but says "
we have to do it from behind because I don't want to loose my virginity."
The man says ok. So the fucking and as soon as the man was done he rips off his costume and says "
HA, I'm really not God."
Then the nun rips off her clothes and says "
HA, I'm not really a nun, I'm the bus driver!"