Teaching assistant 'asked schoolboy what colour knickers she should wear' In the witness box, Turnbull has denied being unfaithful to her ex-husband Ben, and said that she never had sex with the boy, who cannot be identified. Sarah Mallett, prosecuting, asked her about a large number of messages the pair sent each other over the internet. The jury was told ahead of one meeting at an industrial estate, the literacy assistant asked him what colour knickers she should wear - "pink or yellow." When he replied "pink," she wrote back: "Haha, got them on." On another occasion they discussed where they should have sex and he suggested her desk. Miss Mallett said: "You say he would be a legend. You say 'gutted if we get caught' because you would get sacked. They also discussed staying at a hotel and undressing, the court heard. He wrote: "Your dress wouldn't be on for long, like." She replied: "To the floor in seconds." Turnbull told the prosecution: "It was just chat, all talk, it didn't happen." Earlier, Miss Mallett asked her about messages they swapped after they first kissed. He wrote to her: "You love kissing me." She replied: "It's a guilty pleasure." She added: "Clearly teaching does have its perks." When Miss Mallett asked if teaching had the "advantage" of giving her contact with people to kiss, Turnbull replied: "That was a stupid thing to say and I fully admit it. Earlier in the messages I say why am I even doing it. I was confused. Guilty pleasure - we did kiss and I did feel guilty about it. Turnbull bought a book on sexting from the Ann Summers chain because she was inexperienced at it, she told the court. After sending sexual messages to the boy, she told a female friend: "I have been disgraceful, I have been sexting him. I'm mint at it obvs (obviously), because I am an English teacher. Turnbull told the court: "I bought a book from Ann Summers because I hadn't done anything like this before." The defendant said although she sent sexual messages, they had not had sex. She sent the boy a message saying "TDTM," meaning Talk Dirty To Me, the court heard. Miss Mallett asked: "Were you in love with him?" She replied: "No I was not, I cared about him. When I look back now I don't know what I was thinking. She denied the prosecution barrister's assertion she was using the boy, and it was "one big ego trip."