He's going to want to focus on you so use the other two girls as a side show for stimulation. Have them touch him and play with each other but you'll be the centre of his attention
Thrillseekeruk you took the words out of my mouth but also they should both spoil her whist he watches and wanks
Well the three of u lined up on the bed holding hands in the doggy position and let him slide in and out in and out of each of you to start with then prehaps fuck one eat one and have one eating his balls would be a winner however I don't think there will be a losses in this situation