Things heat up between Austin and Summer while Tyler's problems with Abby continue on the next episode of The Young and the Restless.

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While at her apartment, Avery can't help but notice the flirting between Austin and Summer. She immediately asks what's going on and Leslie arrives. Summer explains to Austin that Leslie helped Ian. Austin begins to bash the justice system and Summer agrees. Avery takes Summer to the side to scold her for taking Austin's side, but she's not having it.

After the mini confrontation, Summer and Austin depart. As Leslie talks about the case, all Avery can think about is Summer. She feels she yelled at her because of the strange messages on her website. She explains that Dylan feels Ian is behind it all and that he traveled to Idaho to see Mr. Ward's ex-wife. The minute Leslie leaves, Avery gets a new message that reads, "4MJ. Who are you?"

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Later, Lily and Tyler get to talking at the Club bar. He says that he ruined things with Abby and explains how Mariah always meant a lot to him. Lily says that maybe Tyler has stronger feelings for Mariah than he believes. He just says that he needs to help her. Lily also says that he should fight for Abby.

Tyler then goes to the gym and bumps into Nick. He speaks to him about his negative advice to Abby but Nick refuses to apologize. They start to argue about Mariah and Nick urges Tyler to reveal what she might do. However, Tyler says she's not a bad person. Nick asks if Tyler still has feelings for Mariah, but he denies it. Instead, he says he only wants Abby. After they part, Tyler gets a flirtatious text from Mariah.

Back at Austin's place, he and Summer hang out. They speak about Jack and Kelly and Summer says she will stop acting immaturely. Then, the two are about to make love. In the meantime, on Austin's computer is a post by "4MJ." Is he the one sending cryptic messages?

-- The Young and the Restless airs weekdays at 12:30 p.m. EST on CBS.

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The Young and the Restless