Don't plan too much. Threesome should be something happens spontaneously. For me, I personally hate plans, especially when it comes to sexually related activities. I think it is intentional and it can spoil the surprise and fun. One of the most excitement in a threesome is the sparkles between us when we don't know a clue about each other. Plans are just like rules for me. Nobody likes rules, right? You can go to a bar with the intention to find a threesome hookup. After you find it, you can just go with the flow and do whatever you feel like to do. Plans are not necessary. They say that you should set boundaries beforehand, but actually, you can discover the boundaries of each other during the process. An unplanned threesome is full of surprise, which is also what makes it even more dreamy. That is also the reason why I love it so much. Don't you think it would be much less fun if you make a plan for it?
Keep it fun. There are many ways to keep the threesome interesting. One of the inevitable tips is toys. I think toys is very essential in a threesome. You can play it yourself when everyone is occupied. You can also play it with others. Women can easily orgasm with the help of toys. You can also change positions or even discover a whole new position of your own. Watch porn is also a good way to keep everyone interested. In a word, try new things as many as possible.