Grey's Half bro?

Stepbrother Bonding (Stepbrother Bonding, Yearning, Exposed Book 1) - Kenzie Haven

Can someone, anyone, explain to me the whole doing your stepbrother thing?  Do people think it is less icky because there isn’t a blood tie?  Honestly, honey, if you can’t tell anyone about your relationship than that should tell you something?  This 50 Shades of Grey, sorry Gray (who is the stepbrother) as biker gang.  Stupid, really and not hot at all.