Boy B also said Joynes had shown a "lack of remorse" and that he believes neither she nor her family believes she has done anything wrong.
He adds that he now struggles with the idea of entering into a relationship due to the "negative experience I have gone through with Rebecca".
Boy B continued: "This is not what I wanted for my child, my picture of having children, was with someone I loved in a stable environment, the way that I have been brought up. Sadly, this is not the case.
"Ultimately, I will forever be Rebecca's victim and forever linked to her through our child."
Rebecca Joynes arrives at Manchester Crown Court in May
Joynes gave birth to their son in early 2024, but the child was taken away from her within 24 hours.
Boy B told police Joynes had told him she could not have a baby and they had unprotected sex, but in fact she later discovered she was pregnant.
The day before she was arrested for a second time, Joynes invited him to her flat for a "date night" involving an Ann Summers scratchcard of sexual activities, rose petals and "surprises", the court heard.
At the end it was a baby grow, saying, "Best Dad" on the front.
"I was like, 'What the *advertiser censored**!'" boy B told police
The teenager, who can be identified only as boy B, says he will "forever be Rebecca's victim and forever linked to her through our child" after she was sentenced to more than six years in prison.
news.sky.com