OP--I don't know if Frank would be okay with being bonded necessarily, but definitely moving much more towards that. And of course if he didn't know the Defenders--or if he did and blamed them for Matt's almost death--then he'd be pulling out a convenient gun and threatening them too. And Elektra could be pissed at Matt for leaving her despite bonding to her earlier in college.
Re: Matt/Frank, Defenders OT4, a/b/o, heat misunderstandings