Prompt: Steve gets turned pre-serum state, being so frail that the avengers leave him home. Whoever did this to him had plans, and when Steve is alone in the Mansion/Tower he has to fend for himself. Home Alone action and Steve being creative on how to beat up the villain(s?) with little traps and toys.
Bonus Point: He gets caught in the end, after giving out some major damage to the bad guys and gets saved by the returning Avengers (Tony plz?). They are super impressed.
Fic fill: Working Late by Chubbychoco