Exposing my girlfriend

When I met a new girl a while back, our first date was in a motel room. I'm fairly kinky and decided to try a few things with my new girlfriend that I normally would wait to do until we knew each other better. We entered the motel room, stripped down and I had brough along handcuffs and a blindfold. I handcuffed her hands behind her back and blindfolded her eyes before laying her on her back on the bed. Now that isn't that kinky in itself, but what I did next surprised even me! I turned her on the bed sideways with her feet facing the wall with the door and window. I then opened the curtains all the way and opened the door a crack. People would walk by and some would just shake their head and keep walking, but a young boy, I guess round 18 to 20 stopped and stared in the window at my girlfriend's spread legs. As he stared, I spread her pussy lips and slipped a large dildo into her and began fucking her with it. The young man reached down to the front of his shorts and began massaging his cock. I pointed to the door, and he finally figured out that I wanted to let him come in. When her did, I gave him the sign, finger across my lips, to keep quiet. I let him take hold of the dildo and fuck her with it. He then removed it and bent down and began to lick her cunt. She had a nice orgasm. Then I helped him pull off his shorts and underwear and saw he was rock hard! I pointed to her cunt, and he slipped his cock into her. As he fucked her, I played with his hanging balls until he came hard in her. He was done now and pulled up his shorts and left. I crawled between her legs and ate all of their combined cum from her cunt. It was wonderful! I hope to try this again with a new girlfriend.