Cursed Blessings
Dean wakes up with the knowledge that he's been cursed by the witch he had been hunting, and while he easily accepts the fact that he's in the hospital he isn't so quick on the uptake for his physical changes. Suddenly he's being adopted by two men who keep calling themselves "Papa" and "Daddy" and with bottles, baby carriers and diapers comes the realization that he's been turned into an infant.
The curse will last one year. And if after one year Dean finds that he truly hates his situation, then he’ll transform back into an adult. No strings attached. If he learns to like it, well, let’s just say Sam and Cas won’t have to worry about adoption any time soon. Problem is, Dean won’t be able to convince the curse away, because it’s going to be his heart that makes the final decision.