Rose is suddenly Captain America so once she gets over the initial clumsiness that comes with growing like half a foot overnight, she will probably be happy to assist Davesprite in couriering because she has a bunch of sudden speed and stamina that she should make the best of. If Davesprite wants any help, of course!

Other than that she will just make fun of his passion for couponing and be pissed that she can't get drunk. 8D