Isaac never particularly enjoyed when Stiles was away at college, but he understood his lover's need to learn, to be as normal as possible and so he didn't argue.

That didn't mean he had to like it.

He was sprawled out on the floor of the fixed-up Hale house when he smelled it; his mate's scent. But there was something off, something... different, tainting the scent that he usually enjoyed. Isaac was on his feet and headed to the door within seconds and followed his nose until he spotted Stiles.

Stiles, who was pale and gaunt and had black blood on his lips.

He was shaking and moving quickly to Stiles' side before he even realised it. Hands fluttered uselessly in front of him, unsure. "Stiles... what... what's wrong?"