As the boy staggers back to his feet he laughs "A Girl? Ha, I've never seen a girl with chest hair!"
Seeing what has happened to the boy's ears you don't dismiss what the guy has said and look down at your chest.
You let out a low scream as you see what has happened to you. Your breasts are gone, and your new manly chest now has a light layer of body hair on it. Grabbing at your crotch you feel your new appendage.
You are now a boy, it must be the alcohol you think to yourself, maybe if you drink some more you will pass out and the halucination will end!