Terra was fairly certain from their words that she hadn't been detected yet. It would've been smart to leave, not having been invited to the party so to speak, while she had the chance, but she stood transfixed, that confusing fire she often felt welling up within her as she watched Chessa take Thanatos' cock into her mouth. She reasoned that she was watching so intently because the other girl seemed so gifted at pleasuring their master, but she quickly found herself growing slick with desire.
She almost gasped when their master mentioned bringing her in to compete. She'd surely be found out if he called for her, and there wasn't any way she would be able to best Chessa. And yet the idea to be found out and to become involved only served to arouse her further for the same reason.