There's a simple way to add fire to the feud, you just play off the two basic facts about Cena in 2017. His woman is also a wrestler, they had an emotional ppv moment, and he's gone for long stretches to film movies.
So, Roman blows the whole thing up, dumbfounding Cena by showing him what his woman has been up to while he's been gone. Picture the scene, Roman in Bermuda shorts and a half buttoned tropical shirt, sitting poolside with Cena's lady. Champagne poured, she's feeding him some succulent berries. The symbolism is obvious. At first Cena tries to deny it, it's not real, photoshop, whatever. Reigns gives him just enough rope to hang himself, then the following week drops a hardcore sex tape.
It's 2017, though, so you need a twist. Cena brings his woman out and she pleads to the crowd, it's not what you think, it's not what you think. What we don't notice is that she's not talking to Cena, she's talking to us. The have a match, its disrupted by the big bad for survivor series through Rumble, whoever that may be. He, with help obviously, lays them both out.
The next night, the big reveal, when we find out that cena's woman meant what she said, it wasn't what we though, More of the sex tape plays. This time, Cena steps out from behind the camera, it was a cuckold scene the whole time, the gang reunites, maybe a brief tag title reign with the shared manager, everyone's mind is blown. It's the internet era now, ppvs include live porn, the whole Paige angle plays into it, and the future is here.