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Harry smiled slightly in thanks before doing as she said, getting it perfectly this time.
"Well... sort of; even when I'm not actively feeding, I'm constantly absorbing a little bit of fear from whatever sources of it happen to be nearby - a bit like snacking between meals," Phobius admitted. "However, no matter how much fear I absorb that way, I still have to have an actual 'meal' every now and then - it just increases the amount of time I have before I absolutely have to have a proper feeding."

(Yeah, Oreos are pretty tasty.)

Phobius quirked an eyebrow. "Is that an offer to let me feed off you?" he asked.
Cue Harry once again having to resist the urge to kill the redhead.

"Sometimes, yes. The rest of the time, however, the fear is instead amplified - the mind senses an absence of fear where there should be some and sends more fear to fill its place. My control when feeding is rather shaky, so there's really a fifty-fifty chance of either happening, hence why I prefer to feed off enemies or strangers." Similarly noting that class had ended, he gathered his things and went over to Harry. "Harry, class has ended - you can quit glaring at Weasley now. Also, quit the killing intent - I think even some of the other students can feel it."
Harry jumped slightly, having been rather overly focused on glaring at the boy who'd been flirting with his crush, before looking rather sheepish. "Ah, sorry... it's just - "
"You didn't like Weasley flirting with Katherine and were trying to resist the urge to hex him to smithereens on the spot - perfectly understandable," Phobius assured his friend. "However, I advise against killing him, at least until you've found a way to keep it from being traced to you." It was hard to say which was more disturbing - Phobius's words, or the way Harry was listening attentively to them.

Harry blushed slightly as he felt Katherine's already-slightly-developed body pressing against his own muscular form, but nevertheless rather enjoyed the hug.
"I was simply teaching Harry how to be more subtle when plotting to kill people who flirt with Katherine - cursing them to death like he was planning on doing leaves far too many ways for people to find out he was the one to do it," Phobius explained matter-of-factly... fortunately, there were no teachers in range to hear his blatant disregard for morality and the law as they started walking to their next class.

The unknown boy's smile was immediately followed by an abrupt and definite drop in the room's temperature as Phobius sat on Hermione's other side, staring at the boy in question, his face carefully blank. The only emotion shown was a contemplative gleam in his eye; a casual observer would assume he was deciding the best way to gut the boy who was quite obviously flirting with Hermione... and they would be half right - in reality, he was actually trying to decide what kind of poison to use: slow and painful, or quick and painful?
Harry gave Phobius a disturbed look before wordlessly inching a little farther away from his friend - apparently he still remembered the incident when the part-Boggart had hung him from the ceiling by his thumbs... and the thin layer of frost starting to form under Phobius's fingers was most definitely not helping the creepiness factor. "Er... should we warn that bloke not to flirt with Hermione before Phobius decides to kill him?" Harry murmured to Katherine nervously.

Once the would-be Casanova was removed from the situation, the room's atmosphere and Phobius's expression both abruptly returned to normal as if nothing had been wrong in the first place. "Quite," Phobius answered Hermione calmly, dusting off the frost that had formed on his desk and getting his things out for class.
Harry relaxed, sitting next to Katherine as directed. "Why didn't I think of doing that?" he wondered aloud; mentally, he added "makes the room colder when particularly angry" to Phobius's list of abilities - he was still trying to figure out the other part of his friend's creature heritage.

Harry mouthed an "Oh" of understanding before focusing on the class.
Phobius considered this a moment. "...I'll let him off the hook this time, but if there's a repeat incident, I make no promises. I do not like to share those close to me," he answered stoically, adding mentally, 'Especially not you.' He had yet to fully figure out what the heck he was feeling toward Hermione, so until he did, he reserved the right to slaughter any male who even glanced at her in a way he didn't like.