The 20-year-old, whose grandmother comes from the Lau Group, was instrumental for the Tongans in their two matches against the Vodafone Fiji U20 last week. He scored all his team's points against the Fijians in their 15-all first encounter last Tuesday - converting five penalties.
He also scored 16 points through conversions and penalties in their second encounter as they drew 26-all with the Fijians.
The Australian-based playmaker said he would love to represent his grandmother in the Flying Fijians side.
"To be honest, I wouldn't mind if I represent Fiji," said Masima.
"People don't even know I am a Fijian through my grandma and I want to represent her in the Fiji team."
Masima, who also played rugby league in Australia, said Tonga did well to hold the Fijians on their home turf.
He said the side could have done better but the boys were satisfied with their performance.
"Even though we didn't get the result we wanted but we can see that rugby in Tonga is developing." Masima is expected to return to Australia this week.
Photo Kaiviti Rugby/Facebook. Caption: Fiji and Tonga U 20 rugby players