Steve's already had waaaaaayyyy more treats today than he should, but his face lights up at the offer all the same. He isn't suspicious of her motivations at all. Why would he be? It is his birthday and he's wearing the badges to prove it.

"Yeah, sure! I'll help you out with it," he replies eagerly, only too happy to take the cup off her hands. That's his first mistake.

The second is leaning in to take a sip from the delicious looking beverage. Sure enough, the Milcery hidden inside chooses that moment to burst forth. Steve screams loudly, dropping the milkshake and promptly tripping back into the Miltank behind him who up until that moment had been looking extremely put out her trainer hadn't given her first dibs.