Decide to pretend you hurt your ankle and ask Sebastian to be your knight in shinning armour and escourt you home.

You gasp in fake pain and clutch your ankle. "Ow, oh no I think I've sprained it." Then making sure you say it loud enough for Darien to hear you ask Sebastian, "Would you be my knight in shining armour and help me home?" Sebastian smiles and nods his head. Just as the boat is pulling up to shore Darien and Rai's boat pulls up beside yours. Darien jumps out without even helping Rai out and runs toward you. "Serena are you okay? Do you need help getting home?"  You have to make a desicion.

Get you heart melted by the concern in his eyes and tell him yes, and then thank Sebastian for his offer.

Tell him thanks but you already have help, still angry at him.

Pretend you didn't even hear him and continue on with Sebastian?