Dude answer the door in your towel and be like i'm really sorry I'm running late, have music on and invite her in and open the bottle of wine and pour her a glass in your towel and then say I'll be right back i have to go to my room and change... she might just follow you, either that or you'll have her slightly horny from seeing you wet in a towel. Just be quick changing and getting ready if she doesn't follow u