McKay told Cassie to change her outfit because he didn't want to be talked about for all the wrong reasons. 

Cassie was mad, but after the party, they were having sex, and eight men appeared in his room, and seemingly assaulted him, all while shouting "McGay."

He went to the bathroom and when he returned, he told Cassie to have sex with him. 

The next night, Cassie wore the outfit she wanted, and got close to Daniel, but when she realized what she was doing, he essentially slut-shamed her. 

Nate returned to Tyler and told him to admit to attacking Maddy, and he later did. Nate went to Jules and threatened her into lying under oath and she did. 

Rue was shocked at the way Jules was acting at the party, but we learned it was because of Nate, who showed up to cause more than a few problems for everyone. 

Kat and Ethan proceeded to have sex, but Kat left when she realized Ethan was a virgin after having oral sex, and slept with Daniel.