Matt's an omega. Jessica and Luke are both betas, and Danny's not sure if he's a beta or an omega--K'un Lun society didn't differentiate between alphas, betas, and omegas. They all offer to try and help soothe him, at least, during his next heat, but he says he's fine. They figure it's just him intending to wait it out and be all self-sacrificing, but when they get there, they find alpha!Frank Castle fucking Matt through it--and to their minds, obviously without consent.