Aye crunky, your friend is probably going to try to establish his jab, and his right will only play a defensive role.

Your game plan should involve neutralizing his opponent's jab, establishing your own jab and rhythm while messing youropponent's rhythm.

Since you have the advantage in offence, you should preasure your opponent, counterpunching around his jab, while incorporating headmovement, and footwork.

All out sparring is fun, but I can tell you one thing you won't be learning a whole lot unless you are working toward something. There's a reason why sparring is called practice sessions, your practicing different things, such as techniques (ofence, defence, footwork, tactics etc) and improving your qualities of a fighter (agility, speed, power etc.)

If you want to make a world of difference in your ability as a fighter, go to a gym, learn the know-hows and pick up a sparring partner, if you keep to that your going to make major gains.

-Rocky