Equal Measures... by Heather Mar-Gerrison

I stared at Dad with my mouth open, horror-struck. Gabriel Stewart was the captain of Springfield Academy's football team and had been the object of my desire forever... Gabriel Stewart was my new step-brother...? "His name's Gabriel," Dad said unnecessarily, since I was already having a meltdown over the whole thing. My heart started to thump so hard I could feel it in my ears, "Gabriel Stewart." I managed to murmur faintly.

This is the third book in the Boys Next Door series, with a decent helping of adorable guys, a little drama and just enough naughty bits to keep you turning the pages...