First off: playing something with Wanda and Pietro = always:D Possibly after he gets back from rock climbing?
I've really been wanting to work with Jean's heart/mind dichotomy in some way, even if it's only finding a like mind in Pietro who deals with all sorts of changes probably on a daily basis due to his powers. She'd also love to have someone to bounce ideas off of. She's not really an "I'm better than everyone else" type of person, but there's probably some stuff that people can't typically keep up with her on and having Pietro around would be a nice change of pace. She'd also love to work with him on ways to use his powers!
Yeah, somehow I'm seeing Irene and Pietro having an odd sort of relationship. I couldn't really put my finger on it, but it's definitely what you're describing. She's always thinking ahead and is very pro-mutant so, of course, she's interested in someone who can do what he can. Of course, she also doesn't like that he can mimic HER powers. Though, really, she DOES have Pietro and Wanda's best interests in mind (all while balancing that with her own self-preservation).