[Shouto makes a choked noise when Katsuki bites down on his shoulder, shuddering at how close it is to his neck, one of his more sensitive areas. That brings to mind his knowledge about Izuku's more sensitive areas, specifically his nipples, and, based on Denki's proposal, gives him an idea to start off with... He knows by now that Izuku has a fairly ridiculous libido so the birthday boy is not going to be running out of stamina any time soon, and while he knows Izuku very much enjoys bottoming, he doesn't think the birthday boy is going to have a problem with what he's thinking.
He wraps a hand around his own cock and starts lazily stroking it once Denki pulls away to focus on Izuku, his member now hard from the work Denki did on it, glancing between Katsuki, Denki, and Izuku, who now is stroking Katsuki's cock because he's too distracted moaning from Denki's hand on him.]
That sounds like a good idea. Katsuki, do you think you're hard enough to take Izuku? [He can see that he obviously is, but the moan it gets out of Izuku is worth the tease.] And then I can take you. [If they all get in a line, then he should be close enough to reach around Katsuki to play with Izuku's nipples if he wants, while also murmuring orders into Katsuki's ear in an attempt to rile the blonde up, something he feels will only liven this experience up more.]
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He wraps a hand around his own cock and starts lazily stroking it once Denki pulls away to focus on Izuku, his member now hard from the work Denki did on it, glancing between Katsuki, Denki, and Izuku, who now is stroking Katsuki's cock because he's too distracted moaning from Denki's hand on him.]
That sounds like a good idea. Katsuki, do you think you're hard enough to take Izuku? [He can see that he obviously is, but the moan it gets out of Izuku is worth the tease.] And then I can take you. [If they all get in a line, then he should be close enough to reach around Katsuki to play with Izuku's nipples if he wants, while also murmuring orders into Katsuki's ear in an attempt to rile the blonde up, something he feels will only liven this experience up more.]