Falling for my stepbrother-Narry

Niall's dad just got re-married after 2 years of dating and Niall has only meet her once. But what he didn't know is that she has a vicious, perverted, sexual son named Harry and when they meet for the first time, Harry find his little step brother very attractive. The only problem is that both of them don't like each other but Niall is secretly falling for Harry!