Oh, well, that was a prime opportunity. Two of UA's big hero students, out and about on their lonesome? There was no way Borachio would pass up something like that.
He purposefully stopped looking where he was going, focusing his attention on his phone, and 'bumped into' both of them. "Oh, shit! Sorry, you two!" he said, grabbing both of them by the shoulders to 'help them up'. That contact was enough for him to lay his quirk on them. Past that, well, he would just need to find a way to watch and see what sort of hidden desires got unleashed!
(( @passion-hunter but I'm likely to switch to @ooh-ouch-me-bones partway through based on what we've said in IMs ))
Granted, Shoto and Izuku probably could've paid more attention to where they were going if Izuku hadn't bought so much All Might merch that they both needed to carry it back to the dorms.
"Sorry about that!" Deku replied nervously, thankfully they hadn't dropped too much
"Thank you for the assist" Shoto added, making sure they had picked up everything before moving on more carefully. Of course, neither were aware of the other's quirk effect