an awfully big adventure by Thealmostrhetoricalquestion
“Oh,” Magnus says quietly, all the breath rushing out of him. He grips hold of the doorframe tightly, knuckles whitening, shocked by how strong his reaction is.
Alec is lying on the carpet, surrounded by throw cushions and his discarded shirt, dressed only in a pair of threadbare sweatpants and holey socks. His hair is a ragged mess of curls, and there are dark circles under his eyes – he looks about as tired as Magnus feels, but he’s still eerily beautiful, and he’s holding the baby against his bare chest. Her eyes are closed, and she is lifted up and down gently with each rise and fall of Alec’s chest, her ear pressed against his heart.
“Oh no,” Magnus says faintly.
(Or, the prompt was a Parent AU and this was what I came up with.)