"After The Date" joke

The guy just takes the girlfriend back to her home after being out together, and when they reach the front door he leans with one hand on the wall and says to her, "Sweetie, why don't you give me a blowjob?".

"What? You're crazy???!!!"

"Don't worry, it will be quick, no problem."

"No!! Someone may see; a relative, a neighbor..."

"At this time of the night no one will show up.."

"I've already said NO, and NO!"

"Honey, it's just a small blowie... I know you like it too.."

"NO!!! I've said NO!!!"

"My love.. don't be like that.."

At this moment the younger sister shows up at the door in her nightgown with her hair totally in disorder, rubbing her eyes and says: "Dad says either you have to blow him, I have to blow him, or he will come down and give the guy a blowjob himself, but for God's sake tell your boyfriend to take his hand off the intercom!"