The visiting Falcons jumped on top early, but a late first-half touchdown sent the hosts on their way to the rout Friday.
Leto led 6-0 after Alik Berry connected with Jamie Reid for a 59-yard touchdown and the two hooked up again to draw the Falcons within 21-12. But Southeast got a touchdown with 22 seconds left in the second quarter.
Reid had three catches for 144 yards. Jacquez Reese-Bolden led the Leto defense with 14 tackles.
It was a homecoming for Leto coach Matt Kitchie, who attended Southeast.
"Homecoming didn't end the way I wanted it to," he said.