Mike says that it's about heroin, but some of these lines make me doubt that ("Talking a hundred miles an hour", "She's more than worth it", "I swear she smells just like a flower", "I'd fall to pieces if I had to go anywhere without her", "I love it when she says, 'What's wrong with right here on the counter?'", "Everybody wants to be the sister's mister" make me doubt the heroin claim. The line "Love her even though I'm not supposed to" might be an allusion to heroin.
Mike says that it's about heroin, but some of these lines make me doubt that ("Talking a hundred miles an hour", "She's more than worth it", "I swear she smells just like a flower", "I'd fall to pieces if I had to go anywhere without her", "I love it when she says, 'What's wrong with right here on the counter?'", "Everybody wants to be the sister's mister" make me doubt the heroin claim. The line "Love her even though I'm not supposed to" might be an allusion to heroin.