Mr Wrong Number by Lynn Painter

Bad luck has always followed Olivia. But when a steamy text from a random number turns into the most entertaining relationship of her life, it seems things are looking up. Colin has always considered Olivia his flatmate's annoying little sister. Until she moves in with them, and he realises she's turned into an altogether sexier distraction . . . He's determined to keep his distance, but it isn't easy. Especially when he discovers she's the girl he's been secretly messaging. Now, Mr Wrong Number must decide. Should he shut down the messages, before things get messy?