My wife and I used to be pretty adventurous. Lying in bed one night she asked if I felt like a blowjob, and who am I to turn down oral pleasures. She says how about we go out to the front porch. At this time we lived on a pretty busy street, right across the street from an apartment complex and less than a block from a University. She's just getting down to business when my brother, who was living with us at the time comes hopping out the front door, and says "you guys couldn't sleep either? I'm going to the Quik Trip for a pop you want anything?" I manage a no, and off he goes. The wife rolls over, and I pull up my boxers. Less than five minutes later my brother comes back up the front steps, and the wife and I can't contain our laughter. You could see the understanding dawning on his face, then he said "I interupted something didn't I". I just said yeah, and he told us he thought she was just resting her head in my lap.