Go right for it.

Sirena though Yeria had enough vodka in her to keep her docile for now so she walked right up to her, looking down at her and taking the surprised girl's face in her hands, tilting it up so she could kiss her. She pushed her tongue into Yeria's unresisting mouth and ignored the various half drunk comments of the other party guests around her.

Sirena broke the kiss after a while and smiled. "You know Yeria, I've been thinking maybe me and you should go out after all." According to school politics that was a huge no no on Yeria's part but Sirena picked her for the first person to go for since she knew she had a crush on her.

Yeria gazed up at Sirena, dazed for another moment before she came to her senses. "Oh... uhm... allright Sirena... what would you like do... uh... do?"
"I'd like to take you home and make up for lost time." Sirena said which earned more half drunk "whoooaaas!" and cat calls.

Despite her usual personality Sirena belived Yeria had a submissive streak in her and figured she'd test it out. She reached down and firmly squeezed Yeria's tight ass and kissed her once more briefly before pulling away. Yeria hadn't even flinched. "Come with me." She said, taking her by the hand out of the house and back to her car. After they got in and Sirena locked the doors she thought of what to do next. If she immediately took an agressive role she may scare Yeria away, but it was tempting.