Public fucking with a young couple and an old man

A young couple is walking down the street when they see an old man sitting on a bench. They approach him and start talking to him about his life. The old man tells them about his past and how he used to be a wild and crazy guy. As they are talking, the young couple starts getting turned on and they start making out. The old guy notices this and joins in on the fun. They all start having a threesome right there in the park. The young couple is very excited to be with an older man and they take advantage of the situation. The old gentleman is more than happy to be part of this experience. They all end up having a great time and leave satisfied.