"I--" Severus cleared his throat, as his voice had just cracked rather obviously. "I, ah, thought we could start with Herbology, since that seems to be giving you the most trouble." He scooted his chair a little closer to the table, ostensibly to show her his book that he had cross-referenced exhaustively, but really to hide the tented robes at his groin. "You're welcome to borrow this, if you like," he added, taking and opening his copy of Nine Hundred Ninety-Nice Magical Herbs and Fungi as he slid the book across the table to her.