Ariana reveals the emotional reasons why she wants Tom Sandoval to stick around after her birthday, to little effect. Lisa advises the girls to get back at their boyfriends for going to Vegas, so Lala, Katie and Ariana literally kiss and make up at Scheana's sleepover. Jax, Schwartz and Sandoval strive to be loyal to their girlfriends, but struggle to keep their pants on in Sin City.