He needs milk...!?

Louis is the most handsome, rich, and popular boy in school. All the girls seem to adore him. He's 20 years old.
You're also very well-known at school. You're a rebellious girl, always provoking the teachers and getting yourself into improbable situations. You're 19 years old.
You and Louis are constantly at odds. In truth, you both like each other very much, but neither of you dares to admit it for fear of rejection.
Louis follows a specific skincare routine and needs to avoid certain foods because he is allergic.
You two are roommates, and one day Louis asks you to buy milk for him. But by mistake, you get soy milk, to which he is allergic.
In the middle of the night
Louis: looks at the bottle and then looks at you, completely panicked.
"Say you didn't buy that..."
You: "What? It's milk."
Louis: "SOY MILK! I'm allergic, you idiot!"
Louis: Well, there's only one solution...