When Claire leaves but promises she'll be around for when Matt really needs her, she doesn't just mean when he's injured from a fight. She's also gotten used to seeing Matt trying to cope with subdrop by himself (something that occurs both because he often refuses aftercare and because a lot of the guys he gets into fights with are doms and, if matt's craving a beating, he'll just let them do the work before suffering through a horrendous drop), seeing him practically vibrating out of his skin for want of discipline, seen him generally struggling to get what he needs as a sub who is also a superhero, with a load of other issues besides.

So, she makes Matt promise to call her both when he needs kickass nurse!claire and/or when he needs kickass domme!claire. Idm whether you make the relationship sexual or not or whether it eventually become romantic. Whatever calls most to you, anons.