Drew gets around a lot, even for a child of Aphrodite.
She never thinks much of it. She has this natural charm for a reason, and why should she let it go to waste? No one is getting hurt because of it, and if her siblings look at her a little weirdly because of it, well, they're just jealous that their power over others isn't as strong. There's nothing wrong with using your literally god-given gift as an escape.
She never feels shame as she spends yet another night with a random camper in the amphitheater, probably never to see him or her again—that is, until the random camper is Clarisse La Rue.
Clarisse herself isn't the problem. She's actually rather good—just as rough as Drew likes. And, unlike those other pathetic campers, Clarisse never expects more the next day, nor does she protest if Drew spends the whole night with her, then won't speak to her for a week, only to suddenly be all over her again.
No, the issue is why Clarisse came to Drew in the first place. It's the way Clarisse seems to be attracted to her black hair—the hair so like her late sister's—more than anything else. It's the way Clarisse will put so much passion in their relationship, but it will always seem detached, as though she's picturing someone else. It's the way Clarisse takes extra care to stay out of sight of the other Aphrodite children, because she knows how easily even the most ditzy demigods would see through her.
But not once does Drew try to stop it. She still remembers seeing Silena's giddy face as she gave the daughter of war a goodnight kiss; Clarisse would try to look annoyed, but a smile would always sneak its way through. She still remembers the way Silena, her confidant and hero, had said goodbye to Clarisse, but not her own sister. And she knows that all these nights she spends with Clarisse would kill Silena if she hadn't already gotten herself killed, but the thought only makes her enjoy it more.
She deserves it, Drew tells herself as she kisses Clarisse fiercely. It's for all the wrong reasons, but she tells herself she doesn't care. Silena obviously didn't care about screwing her over, so why should she care about doing the same thing?
Still, when daylight comes, Drew won't look Clarisse in the eye. Drew knows Clarisse likes it better this way; this way, Drew can pretend that there's nothing special about this affair, and Clarisse can pretend that she's with the only person she ever really loved rather than her sister.