In the first incident around midnight, another 16-year-old girl said she went for a walk with the international student because she thought it would be to talk.
But when he allegedly pushed her against a wall and forced himself on her she felt too frightened to resist.
"I tried to roll down the wall to get away but he said, 'that's a good idea let's sit down'. It progressed from there."
She said the international student was demanding, angry and at times swearing and she complied because she was afraid.
"Going through my head was 'If I do what he says, then I'm going to be alright'."
Afterwards she burst into tears and fled the party with friends.
The next night the student told her parents who called the police and an investigation was launched.
She underwent a forensic examination and its believed police seized evidence from the house where the party was held including a used condom and clothing.
The girl said the incident traumatised her, she can't sleep properly and is receiving counselling.
"I really, really want to know that I'm never going to see him again."
The mother of the girl said her daughter was "terrified" and had skipped an NCEA exam this week because she didn't want to go to school where other students were harassing her for complaining.
Both girls attend a different school to the international student but the complainant lives in the same town.
The boy, who claimed the sex with the first girl was consensual, was allowed to remain at the upper North Island school despite a request from the complainant's parents that he be sent back to Europe.
The mother and her husband met with the principal in mid-November and were told legally the school could not exclude the international student, who has four months left of a 12 month placement.
In a letter to the couple she said in another case in Tauranga where five international students were caught smoking marijuana, the school was found to be unlawful for excluding two of the students.
In that case Tauranga Boys' College was ordered to refund two of the students' fees.
The upper North Island school's international student fee schedule for the 2016/17 year was $13,500 for 40 weeks, plus around $5000 in additional costs and a $240 per week home stay fee.
"I can confirm the legal advice we have received is that it would not be lawful for us to acquiesce to your request, not would it be appropriate in the circumstances," the principal wrote.
"[The school] has no jurisdiction nor control over private functions organised independently of the school nor is the behaviour of students who attend such events within our authority to address."
However in the school's International Student Policies and Procedures Document under student behaviour it stated that disciplinary procedures would apply to any serious misconduct alleged, both inside and outside the school.
It said the school reserved the right to terminate the contract and repatriate the student with forfeiture of fees.
On Thursday night the girl's parents put their case to the school's Board of Trustees and were told the boy had now been removed from the district.
It's not clear if the boy has been sent back to Europe or to another New Zealand school.
When asked if the boy had been moved the principal reiterated the legal advice given to the school.
"The Board of Trustees are duty bound to follow all legislation and current case law on the matter, and that is precisely what it is doing.
"We will continue to manage the situation, which we acknowledge is distressing for all involved."
Detective Senior Sergeant Kim Libby confirmed police investigated the incidents but "based on the wishes of those involved and the information available to us, police have been unable to advance the matter at this time".
The mother of the second victim did not want to discuss the issue.
