Rebecca Joynes (pictured), 30, is alleged to have had sex with the pupil - known a Boy B - at least 30 times after they began messaging on Snapchat.
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Obviously, it was my first time, so I was nervous,' the youngster said.
Afterwards, Joynes told the teenager, who feared he hadn't performed very well, 'it's your first time, it was great'.
Boy B said he kept the affair secret from his parents for 18 months, during which time the pair had unprotected sex dozens of times. He claimed Joynes insisted she had a condition which meant she was unlikely to get pregnant.
But on a 'date night' – the night before she was arrested for a second time – Joynes sprinkled rose petals around her flat and set up a sex game of 'surprises' for the boy, the court was told. The game involved an Ann Summers scratchcard of sexual activities and hidden notes, which led him to discover she was expecting his baby.
'At the end it was a baby grow,' the boy said. 'It said something like, 'Best Dad' (on it) and I was like, 'What the *advertiser censored**!'
'She started crying and I started crying, because we were undecided whether to get rid of it or not.
'That was probably the lowest point, we were irresponsible. It's my own fault. I also thought, 'what the *advertiser censored** am I going to do?'
'I can't hide a kid. I had hid the relationship for 18 months from my parents.'
Recalling the moment to police, he said: 'She was crying. She was saying, 'I don't know if I can do this on my own.'