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Published 20:17 18 Feb 2016 GMT
Updated 20:51 18 Feb 2016 GMT
The court also heard that Johnson planned to meet with the 15-year-old for sex on the night before police were contacted over their relationship.
"He said he couldn’t get out of the house because Stacey was there and he couldn’t make up an excuse to her," a witness and friend of the teenager said.
One witness, speaking earlier in the week via video link, told the court Johnson asked the girl to send him a naked picture via Snapchat.
The case continues.