A mum-of-four has recalled the horrifying moment she discovered her best friend was sexually abusing her teenage daughter - who looked on him as a father figure. Natasha Lewis, 40, recounted how her best-friend of 15 years Ricky Powis, 42, sexually abused her daughter Ellie, now 16, right, when she was 13 Powis met Natasha, right, in 2005. Natasha says: …