An east Cobb man has been convicted of taking two 14-year-old girls from a house party and sexually assaulting them last October.

Robert Ray Whipkey, now 52, lured the girls from a house party with the promise that he would drive them to a store, according to authorities. Instead, he took the girls to his house where he assaulted them, according to a statement from the office of Cobb District Attorney Vic Reynolds.

Whipkey was convicted late Friday of rape, statutory rape, aggravated sexual battery, and two counts of aggravated child molestation.

“This case is about a 51-year-old man who used his teenage son to gain access to two 14-year-old girls and then used them to satisfy his own perverted sexual desires,” Assistant District Attorney Susan Treadaway told jurors.

The victims testified that in the early-morning hours of Oct. 8, 2013, they were with other teen at a house party. They left with Whipkey to go to the store, according to Reynolds. Whipkey drove the girls first to a Kroger, which was closed, then to a Circle K. After they left the convenience store, the girls realized the defendant was not taking them back to the party as promised. Instead, he drove them to his house on Octavia Lane, and sexually assaulted them, Reynolds said.

Jurors heard an audio recording in which Whipkey’s son confronted him about what had happened that morning. In the recording, Whipkey admitted indecent acts with the girls, including performing oral sex on one of them.

Eight other young girls between the ages of 13 and 17 also testified that Whipkey had inappropriate contact with them on different occasions.

Whipkey faces a minimum mandatory life sentence, though he could be sentenced to four life sentences plus 120 years. This is his third felony conviction, authorities said.

Cobb Superior Court Judge C. LaTain Kell set sentencing for 1:30 p.m. on Dec. 1.