Is this allowed ?

Hey

I won a gift "Napoleon Total War" (woohoo), that was until I read my email.. he seems to not have the game as gift but he gave me the login to a steam account containing just this game..

I don't want a "second" steam account :( (besides all information and email and whatnot are not mine on that).. so I take I can just forget about my game ? Steam will never allow me to transfer the game to my steam account... I take there is nothing I can do ? (except maybe report the person but that doesn't help me)