Monoshinkami but it's a sub and dom au (SFW ofc)
Denki is what people would call an "abnormal sub" hes a sub through and through but he takes the stereotype of "good sub yes yes" and throws it out the window, hes very open when it comes to follow orders yes but he also pushes in ways that'll aren't harmful, he makes his dom question in ways that'll help improve everything (he doesn't even realize that he does this unless Shinso or Monoma point it outππ)
Monoma: another case of abnormal subs but he takes bratty to whole new level, of course he'll follow orders if he feels up to it but he pushes and prods his dom, he wants someone who can match up with him yet not fully "tame" him, he wants a dom who will play into his theatrics yet will tell him when enough is enough.
Shinso: Shinso is just Shinso/j but seriously Shinso was an odd case to say the least, he never really showed the desire to have subs to the point people thought he never had a role until he met Monoma and Denki, and Shinso felt something in him connect as soon as the sub full of sunshine and the sub full of snark and starlight all but completely barged into his life, they fit perfectly together in ways that'll cause Shinso head to spin both in awe and in irritation.
Yet they all love each other even though people say that denki is too much or too bright for the "dark Shinsou" or the "infuriating" Monoma, Some would say Shinso is too dark or plain for Denki and Monoma, Some would say that Monoma is too infuriating for Denki and Shinso but they all prove them wrong of course.