But Judge Stuart Driver QC said: “The impression I get is he is a young man who feels very sorry for himself.”
Sentencing, the judge told Groom: “You are a predatory, manipulative and persistent sexual offender against girls.”
He said the offences against the girl who he met on Snapchat had a ‘particularly nasty flavour’.
“You threatened her with various things including sending images that you had of her to a child sex porn site,” Judge Driver added.
“A horrible thing to do, aggravating the offence.
“You met up with one girl.
“The 17 counts for which you are to be sentenced relate to seven girls.
“This is not mere online offending. The impact that your behaviour had upon their young lives was not virtual but actual and was significant.”
Groom, of Gervase Square, Northampton, pleaded guilty to 17 offences in total.
This includes six counts of causing or inciting a child into sexual activity; two counts of attempting to cause a child to watch a sexual act; one count of meeting a child following sexual grooming; one count of sexual activity with a child; two counts of possession of indecent photos of children; two counts of causing a child to watch a sexual act; one count of attempting to meet a child following sexual grooming; one count of attempting to incite a child into sexual activity and one count of attempting to possess indecent images of a child.
A sexual harm prevention order was imposed, which means Groom must sign the sex offenders register for life.