A high school teacher has pleaded guilty to having sex with two teenage boys after police received a tip-off that she was spotted kissing a 16-year-old student. Shelby Dawn Lashombe, 25, knew that both of the boys were under the age of consent and had been family friends with one of them for years before she started the twisted affair, according to arrest documents  seen by KWTX . Neither of the boys was a student at Valley Mills High School, where Lashombe was teaching at the time of her