I'd like to see more Jack/Jill interactions. SPECIFICALLY I'd like more ways to get the upper hand on them. Three different kinds of ways, really.
1: Being nice to them. Hear me out. I mean doing things like paying for gifts or meals after a hard day for your oh-so-sweet cousin, getting them out of tough situations, or rescuing them when they're in danger. Why? Simple: They'll owe you. Maybe not enough to give you huge favors, but at least enough to return the favor by sending you tools, good armor, decent weapons, etc.
2: Blackmail and manipulation. Maybe set up some opportunities for Steele to find some really interesting secrets about their cousin to use as blackmail. Or perhaps Steele and Jack/Jill did spend a little more time together as teens or children, and Steele knows a bit about them, specifically weaknesses and things that could be used to manipulate them. And since I've seen some people asking for sexual scenes between Steele and their cousin, maybe manipulate their feelings which may lead to those scenes? (I could see this being kind of difficult, though.)
3: Threats. Hiring an assassin or just holding a gun to their head.
(I based these three on the three options for Steele's personality in character creation.)