A photo posted by Mariana Tolentino (@mariana_tolentino7) on May 30, 2015 at 3:06am PDT Subscribe | UPI Odd Newsletter Subscribe ROSWELL, Ga., June 1 (UPI) -- A Georgia Hooters waitress who donated her kidney to a customer she had known for only three months said the organ is "working amazingly" post-surgery. Marianna Villareal, who serves tables at the Hooters in Roswell, said she struck up a friendship with customer Donald Thomas while her own grandmother was suffering kidney problems similar to those faced by Thomas. Advertisement Villareal said her inability to help her grandmother spurred her decision when she learned about Thomas' troubles. "I said, 'Well I have two kidneys, do you want one of mine?'" Villarreal told WXIA-TV. "I wasn't able to do anything for my grandma," Villareal said, "If [Don] can live two more years, happy as he's ever been, that's fine with me. That's not up to me. I did my part, now it's God's turn to keep him alive." A photo posted by Mariana Tolentino (@mariana_tolentino7) on May 29, 2015 at 12:52am PDT Advertisement The two went into surgery Friday. "The kidney is a PERFECT match and is working amazingly!" Villareal wrote in an Instagram post after the operation. "As for me my kidney is working like there's still 2 in there. I know God will watch over us for the rest of our lives and may the glory always be for the lord of lords! Once again thank you all!" Villareal offered an update on Thomas' condition Sunday. "So today Don used the bathroom by himself for the first time in 5 years! He was so proud of himself that he began to cry! Apparently we broke a record on how fast my kidney started working. As soon as they connected it he began to urinate on the operation table," she wrote. So today Don used the bathroom by himself for the first time in 5 years! He was so proud of himself that he began to cry! Apparently we broke a record on how fast my kidney started working. As soon as they connected it he began to urinate on the operation table. In total he has done 20 gallons in less than one day. We both got up and started walking that same night. My incisions are starting to itch so that means they're healing! Thank you all for your prayers of fast recovery. God has listen and he's doing a great job! Thank you lord for giving me the opportunity to give life to someone you died for years ago. What you did for humanity inspired me the most! Advertisement A photo posted by Mariana Tolentino (@mariana_tolentino7) on May 31, 2015 at 8:33am PDT Read More 'Lion King,' 'Aladdin' Broadway casts in airport 'singing battle' Elephant steals handbag from car in India Texas goose turns the tables on young girl