"That's because I've had bad luck with Slytherin schemes." Harry said, only half teasing. "I try and forget about that part of Slytherin nature. Especially since whenever I end up in a conversation with two Slytherins they always gang up on me." He added with a pout, though he knew Severus would just find his comment amusing.
Laughing again Harry shushed Jack, "He looks happy. Sides you can tease him later." He paused remembering Jack's flirtation with Terry. "Unless of course you're jealous." He added, proud of keeping a straight face.
"Hmmm I could say I enjoyed the kiss but I know that your ego doesn't need to be inflated." Harry teased him, "I should try and get one to hit you and then make you suffer whatever embarrassment comes along with it."
Though it might be amusing to see how people reacted if he flirted with Jack that openly. He wasn't sure how Severus would like that though, people might start looking into Jack more if they saw Harry openly kiss him. Accepting was different than initating to most people.