Despite herself, she knew that Rose was right, and she knew that Rose would keep pushing her until she actually fed. It was just that Lissa really didn't want to do that to Rose again. Rose needed to keep her wits about her, but if Lissa didn't feed she might just faint and that wasn't a really good thing either.
Her argument was what Lissa expected, and her expression said as much so. "Fine, but I'm only taking a little bit so I don't pass out on you and we can find a willing donor right after." She said with a voice much stronger than she felt. Lissa's expression changed to worry, shame, and just plain feeling horrible for what she was about to do. They might not be bound psychically anymore, but they knew each other well enough to read the tiny expressions.
Looking around quickly to make sure there wasn't anyone who could watch, she moved hesitantly towards Rose. Opening her mouth wide enough to actually show her fangs she dug them quickly into her best friends neck drinking only for a couple of moments, she probably did need more blood but she wasn't going to drink anymore from Rose, she just wasn't. Backing off she quickly whipped away any signs of blood on her lips as she gave Rose an apologetic but grateful look. "Thank You." She said softly as she looked down before looking back up. "Are you okay?"