Bisexual First Timers!

What happens if your chick tells you she'd like to fuck you AND your best friend at the same time? And then what happens during your raunchy 3-way when you feel HIS hand stroking your dick? Bisexuality happens, dude... and you might as well give it a shot because it could be great! Hey you're really just three naked, horny people getting off... What could be more fun than that?