It Wouldn't Be Frequent.

Remember, he saw Anne while eating in the cafeteria, but after he was done eating, she was nowhere to be found anymore, he didn't see her stroll out of the cafeteria.

As said, she sighted him as well, but she acted like she didn't see him...she just focused on her food. Now, she planned on telling Aiden something, but she can't do it in the cafeteria, he was with his friends.

So she decided she'll wait for him at the compound. And while he'll be passing with his friends, she'll signal him to come meet her.

How do you think she's been meeting with Aiden to ask him for sex? By signaling him to come meet her. Aiden was always with Ava and Oliver most of the time. So sometimes, she'll stand at one of the doors to Aiden's classroom while trying to get his attention.

So when she's finally succeeded in getting his attention, she'll signal him to come outside...she'd do this without anyone noticing. And you'll see Aiden stand up from his seat and stroll out of the classroom.