a desperate boyfriend

One night a guy takes his girlfriend home. As they are about to kiss each other goodnight the guys starts feeling a little horny. He leans over, putting his hand on the wall and smiling says, "Honey, would you give me a blow job?"

Horrified, she replies, "Are you mad? My parents will see us."

"Oh come on, there's nobody around, they're all sleeping," he says.

"No way. It's just to risky," she replies.

"Oh please, please, I love you so much," he says.

"No, no, no. I love you too, but I just can't," she replies.

"Oh yes you can, please," he says

"No, no, I just can't," she replies.

"I'm begging you," he says.

Out of the blue, the light on the stairs goes on and the girl's sister shows up in her pajamas, hair a mess, and in a sleepy voice she says, "Dad says to go ahead and give him a blow job, or I can do it."

"Or if need be, he says our mother can come downstairs and do it, But for God's sake take your hand off the intercom."