Based on a sentence I read in Flawed Lines by diagonalist.
""Harry, TO THE LAB! Draco, The Headmaster wants you." Snape finished with a wiggle of his eyebrows.
"OMG! I knew Albie would come around!" Draco ran out squealing to find his darling Dumbles.
"Now Harry, TO THE LAB!" Yelled one almost giddy greasy potions master sticking one finger up in the air. Of course he wasn't actually giddy, that would be undignified.
"Ummmm... sir? Are you sure we should go in there? Draco left some of his 10th degree vegan stuff in there, and that was two days ago…."
"Harry, have I ever steered you wrong?" a tone of hurt and betrayal entering Severus's voice.
"Well there was that one ti-" A hand suddenly clamped down on Harry's mouth.
"Let's not talk about that, okay. Hehe...", A somewhat nervous look upon the sexy sallow face of the tall man. (sigh) (looks around seeing the various scared and disgusted looks from poor readers) He hem, right, back to the story.
Harry glared up with an almost Snapish look.
"OMG! YOUR FIRST GLARE! I'm sooo proud of you son!"
"WTF! YOU'RE MY DADDY!" Harry curled up into a little ball singing "she bangs, she bangs".
"OH NO! I KILLED MY SON! Wait….. Haven't I been trying to do that for years? Ah well. Bye Harry! I'm not your father by the way." And with that, the sexy potions master went to his lab. Cloaks billowing and all.