The belt arrives and you meet someone new

Three days later you are laying in bed, Carrie next to you. She has her phone in one hand, your dick in the other one. As usual now, she is completely naked.

"What do you say about her?", she asks, showing you a picture on her phone. Its a girl with black hair, about shoulder length, she wears silver piercings and accessories, and wears a tight black top which reveals her muscular arms and belly.

"I like her" you answer, and in response, your girlfriends hand begins to work a little faster. Over the past few days, she has shown you pictures of her female friends and aquaintances in trying to find out your typea bit more.

"Thats Athena, or at least thats what she calls herself. I know her from High school back in the day, shes pretty cool, works as a barkeeper now and goes to the gym a lot."

"I can tell", you say, feeling yourself getting closer while looking at Carries green-eyed friend, when suddenly the doorbell rings.
"Thats gonna be the package we´re waiting for", you say, getting up and wrapping a towel around your waist, barely hiding your penis. "I´ll get it real quick."

You go down the hallway and open the front door-just to be faced with something you did not expect. Instead of the usual mailman who delivers packages around your area, an old, friendly guy, you look in a young womans face.

Brown hair put up in a ponytail under her cappie, a bit smaller then Carrie, she looks at you perplexed with piercing blue eyes.

Suddenly you become very aware of your lack of clothing and quickly apologize. "I´m sorry for appearing like this, i expected the old mail guy, and thought he wouldnt mind."
The confusion in the girls face turns into a smile. "Oh..thats okay, im new in this area anyway, so its fine. What other way to quickly get to know each other, right?"

Your dick twitches under the towel as you watch the girls eyes wandering up and down your muscular body, resting on the bulge in the towel for a second.
A noice from the right tells you that Carrie is watching you from the hallway, outside of the Mail womens field of view.

"Well anyway", the mail woman says, "What do we have here..." Her eyes scan the package, then widen for the fraction of a second. "The stainless steel chastity belt for women...interesting..Well, either way, i need your signature right here." She pulls out an instrument for you too sign on, while you take the package.
As you grab the pen to sign, your other hand holding the package, you feel your towel slipping. Before you can do anything about it, your towel falls to the ground.