2 people boost at a time
That means u and your guest may be waiting for the next game to boost
So what you need to do is die for 6 rounds in 1 game
Then when it's your turn to boost u get to kill the 3 others(2 guests and 1 person waiting their turn)
Once u kill the 3 u Plant the bomb(if u have it)
Once u plant u will have a sentry gun throw it
Pick it up
Tell other booster to defuse
Now just kill the people and destroy each others killstreaks.