Denki definitely comes up with “pin the weenie on the Shouto” game for Katsuki’s bachelor party and it’s just a cut out of Shouto with his hero utility belt
Thinking about omega Izuku with his two aggressive alphas, Katsuki and Shouto. When they bicker and frustrate him, he refuses their cocks and makes them fuck each other while he watches and touches himself.
It happens often enough, he's starting to think they like it.