You chose to stay in your room waiting for your girlfriend to return. In the meantime, you looked around the room more closely to get to know the environment better.
After a minute you notice your suitcase was ajar, you were sure you had left the suitcase fully open after putting all your documents in it before stepping into the shower. You open it to see if nothing was missing and find something that wasn't there before, it was a 12-inch hard cock with orange-sized balls at its base. The male member was perfectly alive despite not being attached to anyone, and had precum dripping from its tip onto the clothes stored there.
"Ellen? Is you there in the suitcase?" you asked
The cock inside the suitcase moves a little as if trying to give you a positive answer.
"Why were you hidden in the suitcase?" You asked but your girlfriend didn't react. "Please get back to normal and talk to me." you asked and got no answer again. You then took your girlfriend and said "You are very stubborn right now. Do you by any chance want me to use you?"
With the last thing you said, you felt Ellen pulse in your hands and the flow of precum oozing at her tip increase.
"You're pretty perverted you know." you said and felt her throbbing again in response, making you believe she liked it.
You then gave your girlfriend what she wanted and started by kissing her tip, treating her urethra as her mouth, then you opened your mouth and put her inside. As expected your girlfriend was too big, but just imagining putting her in your mouth made your body adapt to it. You held Ellen by her balls and kept putting her in and out helping her to fuck your face until you felt her spasm, feeling her come and shot her cum directly in your stomach.
When you felt Ellen's orgasm start to subside you pulled her out while she still released her last cumshots. You lay down on the bed and put your girlfriend, who was already getting limp, on your stomach resting between your breasts.
Watching your girlfriend rest on top of you, you saw her tip change and become a miniature version of her human head from before she turned into a dick.
"Thank you dear, I really needed this." your grlfriend said
"Glad you like. But why did you decide to become a dick? If you grew one between your legs or became a man I would understand, but if you become just the dick with the balls without the rest of the body I can't understand." you asked
"In fact it was by accident. When you walked into the bathroom I started I figured you were going to make some change in you and, as you've already told me you wish your dick was bigger, I thought you'd make it bigger, that's why I pictured you in the bath, with your dick much bigger and jacking off. After that I got lost in my imagination and saw myself together with you in the bathroom helping you to have more pleasure with that cock between your legs. The main problem happened because at some point I was already more worried about the dick than who it belonged to and I only thought about making him come. When I finally realized what was happening I was almost finishing my transformation on this dick, I tried to call you but I lost my balance, I fell into the open suitcase and it closed with me inside." Ellen said
"You know you can transform at will in this room, don't you? It was easy to get back to normal and the suitcase was not locked, so you could get out of there easily." you said
"I know, but I completed my dick transformation so hard that all I could think was that I had to come and nothing else crossed my mind. Even when you found me and asked me to get back to normal so we could talk, the urge to cum was such that just thinking about getting back to normal before emptying my balls seemed unforgivable. Maybe it's the hard-on instinct. After that I'll never complain again when a man told me their dicks have a mind of their own." your girlfriend said
"I get it. So tell me, what did you think of the experience?" you said
"I loved it. Oh oh, just remembering I feel like I'm getting hard again." Ellen said and her cock body became erect again.
"Do you want me to make you come again or do you want to get back to normal?" you asked
"Actually I do. Just one more time and I'm back to normal." Ellen said
"Alright I suck you one more time." you said
"No I don't want you to suck me. You're a girl now, I want you to shove me deep between your legs." Ellen said
"Do you want me to put you in my vagina?" you asked
"It is clear. Most women would love to have a cock as beautiful and firm as me inside them someday, so you should take the chance." your girlfriend said
"I can do this. It's worth trying." you said
"I hope you do, I'm looking forward to being inside you." Ellen said and soon afterwards her head became just a normal tip for the dick she was.
You took off your panties and stuffed Ellen into your pussy, then pushed her deeper and deeper until only her balls were out. You stopped for a minute, just feeling how full you felt having your girlfriend inside you, before finally pulling her out until she was almost completely out and pushing her all way inside again. You had an orgasm, but Ellen still didn't come, which forced you to continue. When you reached your second orgasm with your cock-girlfriend inside you, you felt her pulse and her cum invade your womb.
After this last orgasm you felt tired and just slept with Ellen inside you.