He does plan on staying until the potion is completely done, both to help Magnus and to keep him company. His boyfriend overextends himself from time to time and Alec has learned to see the signs. Taking care of him at times like this is no chore at all.

"I guess it comes with knowing you." Which tickles Alec as much as anything else, the idea that he's gotten to know Magnus well enough to pick up on these little preferences of his. It's a herbal tea, one that will blend well with Chinese food, and he leans in for another kiss. "If the potion works, you can take me anywhere you please."