You finish the shower and go back to the bedroom to find your girlfriend. When you got there you saw her sitting on the bed with her back to you, in a position that you couldn't see what she was doing, all you could see was that she was moving her right arm continuously. You sneaked up on her to see what she was doing and saw that she had a 10 inch cock between her legs and was jacking off.
"I never imagined you were interested in these things." you said
Your girlfriend was startled and jumped up facing you, who laughed at her reaction. "It's not funny, you scared the shit out of me." she said
"It's not my fault you focused so much on jacking off. Who knew you wanted a dick that bad." you said still laughing a little.
"I was just curious and wanted to try a little. I was hoping to finish before you left the bathroom but I think I got carried away. Don't worry, I'll switch my cock back to my vagina right away." your girlfriend said, still with her hard cock between her legs and a pair of big balls underneath.
"You do not have to do this. I did not book our stay here to impose limitations on the transformations you want to experience. If you want to have a dick I won't complain and if you want I'll become a girl for you." you said
"Don't do that, at least not yet. I wanted to have a moment with you while we're, you know, equal down there." your girlfriend said looking a little embarrassed at her cock
"OK. What do you want to start with?" you said
"Well, for starters I would like something simple, how about the two of us watch porn together and jack off like male friends?" your girlfriend said
"It's not such a bad idea." you said
Your girlfriend turned on the TV while you took tour pants off, accessed the movie catalog and entered the adult movie section. She chose a shemales porn, which you believed was to make you more comfortable with her, who was a shemale at the time. You sat side by side on the bed and jacked off while watching the movie, but you felt a little envious as your girlfriend's dick was about twice the size of yours. You solved the problem just by imagining your cock as big as hers, so that your member grew to the desired size.
"What an envious guy." yours girlfriend said laughing as she continued jacking off.
During the course of the film you and your girlfriend came a few times, using the possibilities of the bedroom to continue until the end without getting tired. Sometimes you made a little exchange and stroked each other's dicks.
"Tell me, what are you thinking about having male orgasms?" you asked your girlfriend
"It's very different and better than I expected. I'm getting good at jacking off." your girlfriend said
"So how about we move to the next level?" you asked
"Next level? Are you going to want that even with me being male down there?" your girl friend asked
"I do not see a problem. No matter what form you take, you will always be the Ellen I love." you said and kissed her while holding her balls.
After the kiss Ellen made you lie down on the bed, then she was on top of you and lowered on you putting her big balls on your face. "If you want my balls that bad then take them." she said. You sucked and kissed your girlfriend's smooth balls while holding her ass to help her keep her balance, meanwhile you felt her ballsack get fuller as another pair of testicles descended on it. "Here are a few more balls to help satisfy you." she said
You knew Ellen was loving your activities on her balls, so you freed one hand and started using it to stroke her hard cock, which was too much for her and made her lift her ass and bend forward to the come, her cum hitting your belly and spreading over you. As was to be expected with her having four testicles now the amount of cum that came out was much higher than the previous times and, as she still only had one dick and it was still the same size, it took her longer to dry her balls.
Once another Ellen orgasm ended she was panting on all fours over you, who had your own cock still hard as you stared at your girlfriend's shemale ass. You slipped out from under her, then went behind her and braced your cock at her rear entrance.
"Calm down, not in my ass." Ellen said
"Yes, I'm going to fuck your ass. You were the one who said you wanted to have a moment with me with you being a shemale, this way you don't have a pussy, so the only option is for me to fuck your asshole." you said
"If you want to fuck me so bad I get a pussy again but please not my asshole." your girlfriend said
"No, you will remain a shemale until I finish. Don't worry, you won't like it." You said and shoved your cock into your girlfriend's back entrance.
You were pushing your cock deeper and deeper into Ellen's ass, your member at its current size was way too big, nothing that didn't go unresolved with your girlfriend increasing the elasticity of her body and allowing you to go all the way inside. Soon her cock was fully hard again and she couldn't stop moaning.
"Please stop. I'm not enjoying any of this." Ellen said
"That's what your mouth says, but your body says otherwise." you say making it clear the hard cock swinging in front of her
"All right, I admit it. I was wrong and I'm enjoying this too much." your girlfriend said
You kept fucking her some more, with your balls hitting hers from behind, until you came. You left all your cum deep in Ellen's ass, making her come again and her cum add to the mess you guys had done on the floor before.
When her orgasm ended, Ellen said she was tired. You agreed with her since it had been a long journey to the resort and you guys had had so much nonstop sex. It was getting late, too, so the two of them simply lay in bed and fell asleep wondering what the rest of their vacation would be like.