It's no chore to stay by Magnus' side, making sure he eats, making sure he rests as he can. Alec knows how much his boyfriend will put into his work for others, how he'll push himself past the point of exhaustion, using up all of his magic to help others. He wouldn't change it, the generosity is a beautiful part of Magnus' soul, but he will do his best to ease the burden Magnus takes on his shoulders.

When the potion is done Alec moves close again, hugging Magnus from behind, chin hooked over his shoulder as he looks at the glowing liquid. Hopefully it works as Magnus had predicted; hopefully it's worth the strain he'd given himself. "Does this mean I get to take you to bed?" he murmurs, and there's nothing of innuendo in it, just concern for energy expelled.