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Bat Family AU wherein only Barbara and Tim know Huntress' true identity. So when Tim needs a fake relative after Jack's murder, instead of hiring a complete stranger to pose as his uncle, he hires Helena to be his fake aunt.
As a teacher, she is against him dropping out of school but she knows him and listens to him, so she realizes how hard the last few years have been on him, especially with how often he had to change schools. They compromise, with her signing him up in a homeschooling academy. He does a lot better and even starts taking AP classes in several subjects since his training has caused him to advance in them. Not having to get up early for school or hide so much from his teachers/classmates/parental figures(s) also takes a lot of pressure off of him.
Helena gains access to the Robin's Nest Tim builds in or near their building. She also upgrades her suit and staff using some of the materials and specs from his suit and gear. They both are very good at recognizing when the other is getting close to someone who isn't good for them, or pushing themselves too hard, and they intervene.
When Barbara eventually learns that Helena is posing as Tim's aunt (probably because Helena told her) she's like "Okay, I expect this kind of thing from Tim, but why would you agree to this?!"
Helena points out that she needed to find a way to supplement her teacher's salary if she was going into keep up the vigilante gig anyway; Robin's new computer set up rivals Oracle's; and this way she can make sure the bambino does his homework and gets enough sleep.
Barbara realizes that both Robin and Huntress have been on top of their game lately.
Once she calms down from realizing that Tim just needed a decent parental figure all this time, she and Helena start trading notes and working together to keep Tim and Cassandra from turning out like Bruce, Dick, or Jason.
Whenever they learn about this, Bruce and Dick will be insulted. Jason and Alfred will add their own notes to help.
When Tim's report card comes back with straight A's and Cass has learned to read all the street signs, Helena and Barbara take them out for pizza and gelato to celebrate.
Occasionally, Tim reminds Helena that she's just supposed to pretend to be his aunt. She ignores this and reminds him to do his schoolwork and eat something before patroling.
It works.