You tell Mia that you're going to bath first and go to the bathroom as you didn't want her to see that you had pissed outside the toilet so you intended to clean everything up during your bath time. You went into the bathroom and tried to take advantage of the time the bathtub filled to clean the bathroom.
Mia went into the bathroom saying she was going to take a bath with you, but catching you cleaning and noticing the smell of pee mixed with the cleaning product in the air, she realized what had happened.
"Don't tell me you couldn't aim for the toilet." Mia said
"It wasn't now, it was the other time I came to the bathroom. I couldn't aim because my cock was hard. How do guys manage to aim in this situation?" You said
Mia laughed at you, which pissed you off a bit, so she said "I'm sorry for laughing at you, but trying to aim for a piss while having an erection? I would be surprised if you could. "Even guys can't do that. I still remember how much my mother fought with my brother for doing that and he always argued saying that it was practically impossible to aim with a hard-on. I mentioned this to him once when I was drunk and he said they have to almost do a contortion to hit the target."
You laughed, feeling like a fool for believing you'd been clumsy. Even so later you tried to convince Mia to let you take a bath alone, but she didn't want to. She reminded you that you never had a problem taking a bath together, and that you didn't have to be ashamed of it just because you had a dick now since she had grown one as well. She then helped you finish cleaning up and by the time you were done, the water in the tub was perfect for the two of you. You got into the tub first and settled in, and Mia got in right after.
"What am I going to do about my clothes? I only wear pants, my only skirts are my work uniform and my underwear is very uncomfortable." you commented thoughtfully to Mia
"So just wear skirts, I don't mind lending you mine. As for underwear, I might pay my brother a visit tomorrow and get some from him without him noticing. After you get back to normal I can return them." Mia said
"This helps a lot. By then we won't need it anymore." you said
"Exactly. I plan to buy new underwear for myself. I like having a cock and intend to keep this one between my legs for the time being. I don't want to give up my vagina, but if I can't have both at the same time I'll change genitals from time to time." Mia said
"Will you keep your dick? And I can't wait to get rid of mine." you said
"I don't know why you want to go back to normal so badly. Didn't you like the experience before, the feeling of coming like a man?" Mia said
"It's not that I didn't like it, it's just that it's not natural, a woman shouldn't have a dick." you said
"Who cares if it's natural or not? The important thing is how you feel about it, and if necessary I'll make you like having a dick so much that you won't want to lose it for good." Mia said and slipped, submerging her whole body in the water except her head. As she did this her legs intertwined with yours and you could feel her balls being pressed against yours. Soon the tip of her now hard cock emerged from the water.
You tried to get out of the tub, but your roommate grabbed your hand and pulled, making you fall on top of her. She then rubbed her cock against yours making you get hard too. Mia then made you stand up and stand beside the bathtub, then she sat on the edge, took your cock in one hand, holding it tight and started sucking. With her other hand she stroked her own cock.
You wanted to resist, but you were enjoying it so much that you didn't find the strength to stop the roommate, instead you held her head preventing her from stopping. Soon you came, Mia struggled and managed to swallow all of your cum. She then got up and kissed you, making you taste your own cum in her mouth, as she continued to jack off and come, her cum falling and mixing with the water in the bathtub.
After you were satisfied you finished your bath and, seeing that it was getting late, you simply laid each one naked in your own bed to sleep, mainly because you had to go to work early the next day.