Stepbrother?

And before I can stop him he smashed his lips against mine, making me gasp. I don't pull away though, in fact, I kiss him back. This is wrong, I tell myself then push him away, he groans.
"Baby, please," Brandon says, his hazel eyes looking into mine begging.
"No, no. It's wrong. This is wrong...your my brother for Pete's sack."
"Stepbrother for that fact," he says winking.
"I...I, just can't." And before I can stop myself I'm kissing him again.