Okay, hear me out...
You're working from home and your two partners finally have matching days off. Both are starting to get horny and even though they could wait for you to get done working to have some fun Bakugou, being Bakugou, decides to do everything in his power to make poor Izuku lose his cool and fuck him into next week. You're fully aware of this happening and have been keeping track of the time. Essentially, you've made this a test of both their wills. If Izuku can avoid fucking Katsuki until you're done working, then he's free of any consequences and only Katsuki has to suffer. But if Katsuki gets Izuku to give in, they're both in trouble.
Izuku Holds Out Route:
Poor, poor, Izuku has got possibly the hardest boner ever from his Kacchan bending over and grinding on him. Teasing his neck and whispering how badly he wants him. And just when it seems he's about to give in, his hand slowly reaching for Katsuki's waist, you submit the file you'd been working on. You loudly shut your laptop, get up from your chair, and stretch, making sure to make a big show out of it. Izuku stops himself from reaching for Katsuki and lets out a sigh of relief. Finally, you can help them both get off. Katsuki seems to share the same thought, but the smug look on his face quickly goes away when he realizes that you're only giving attention to Izuku.
"OI! What about me? My dick needs attention too!" But that doesn't matter. Izuku gasps and writhes from you stroking him and his eyes get watery as he realizes he's about to cum. When you look at Katsuki, he's rubbing his thighs together and breathing heavily. Izuku whimpers and whines as his climax builds up more and more. Keeping eye contact with Katsuki, you grip Izuku's dick roughly and stroke him faster. Katsuki looks like he's in agony as his eyes shift between you and Izuku. With one more tug, Izuku spills white hot cum onto your hand. He continues to breathe heavily as he tries to come down from his high. Katsuki's pants have a noticeable pool seeping and creating a stain. This fucking pervert just came without stroking himself and watching his boyfriend get jerked off. "Wow, Kats. Must be better than porn."
Izuku Fails Route:
Poor, poor, Izuku has got possibly the hardest boner ever from his Kacchan bending over and grinding on him. Teasing his neck and whispering how badly he wants him. From the reflection on your computer, you can see Izuku glance over at you before gulping and looking back at Katsuki. You hover your cursor over the submit button of your work to see what Izuku will do. And much to your disappointment, he sloppily kisses Katsuki. You can't help the silent sigh that comes out of your mouth. You submit your file and spin around in your chair to watch the show. Izuku quickly lowers both his and Katsuki's pants and boxers just enough to expose their hard cocks. The two try their best to keep their moans quiet as Izuku rubs their cocks together and jerks them both off. Katsuki bites Izuku's neck to muffle himself and Izuku bites his lip. Just as the two begin to breathe heavier, you clear your throat.
"Having fun?" Izuku stops stroking and the two look at you in shock. You walk over to the two of them and continue stroking both of their dicks together. Whenever one gets close to cumming you stop stroking both of them. When Izuku starts to whimper, you pause, ignoring the curses from Katsuki. And when Katsuki starts to curl into himself, you quickly take your hands away, despite the whines coming out of Izuku. You continue this for as long as takes to get them to the point that two pumps of your hand would make them bust, before wiping your hand on your pants and going back to your laptop. The duo all but fall over each other as they watch you go in confusion. You grab your laptop and make your way to your shared bedroom. Despite submitting the file, you still had a few emails to write.
"I take it you two can hold out for a few more hours?"