One night a guy takes his girlfriend home.

As they are about to kiss each other goodnight, the guy starts
feeling a little horny. 

With an air of confidence, he leans with his hand against the wall
and, smiling, he says to her: 'Darling, would you give me a blow job?'

Horrified, she replies 'Are you mad? My parents will see us!'

Him: 'Oh come on! Who's gonna see us at this hour?'
Her: 'No, please. Can you imagine if we get caught?'
Him: 'Oh come on! There's nobody around, they're all sleeping!'
Her: 'No way. It's just too risky!'
Him (horny as hell): 'Oh please, please, I love you so much?!?'
Her: 'No, no, and no. I love you too, but I just can't!'
Him: 'Oh yes you can. Please?'
Her: 'No, no. I just can't'
Him: 'I beg you ... '

Out of the blue, the light on the stairs goes on, and the girl's
little sister shows up in her pyjamas, hair dishevelled, and in
a sleepy voice she says: 'Dad says to go ahead and give him a blow
job. Otherwise I can do it. Or if need be, dad says he can come
down himself and do it. But for gods sake, tell him to take his hand
off the intercom...'

anon