Alyssa left Kelly and Samiya and went to the bathroom to piss, but she went alone because she also had her dick hard and her erection didn't go away. When she entered the bathroom there was only one woman who was washing her hands, which she didn't look at and went straight to a stall, where she locked the door. She lifted her skirt, lowered her panties and tried to aim for the toilet, but discovered one of the problems that men sometimes face as she couldn't aim down thanks to her erection.
She was forced to deal with the erection problem first, having to jerk off making as few noises as possible before she managed to pee. She couldn't silence, but she was convinced that the sounds she let out weren't enough for anyone to notice what she was doing. Eventually she came, letting her cum splatter around the toilet. After her cock finally went limp she was able to pee and hurried to leave before anyone realizes the mess she's made and can make any connection with her. When she opened the stall door she saw that the woman who was washing her hands when she entered was still there, but now it seemed to be waiting for her and, to make matters worse, she recognized the woman.
"Was it you who was there Alyssa? Why don't you say hello to your teacher outside of school?" The woman said, she was Mrs Carson, the biology teacher at her school.
"I'm sorry, I didn't realize it was you." Alyssa said
"I understand. But what did you do that took you so long to get out of there? Wait, this dirt is..." Mrs. Carson said and I enter the stall that Alyssa had just left, where she took a closer look at the toilet "
"This is cum and it's fresh. Alyssa, you... it can't be... It's absurd but I can't think of any other possibilities. Is this your cum by any chance?" Mrs Carson said
"Of course it's not mine. That's not possible because I'm a girl. The fucking dirt was already there when I walked in, some guy must have been up there when no one was watching." Alyssa lied
"You're lying, I used this stall before you and this cum wasn't here at that time. That's where it gets really weird, it looks like this is your doing, I'm tired that you're a perfectly healthy girl and that's what makes it impossible, unless... No, this hypothesis is also impossible. It's too fresh." Mrs Carlson was saying, trying to figure out what had happened.
The biology teacher was the last person Alyssa wanted to find out about, as she was the worst person she knew when it came to keeping secrets. She tried to take advantage of the distraction and quickly turned around to escape unnoticed, but she was closer to the sink than she thought and as she turned around she bumped her balls into the corner, having her first experience with testicular pain, she doubled over in place taking her hands to her balls. She got distracted enough to forget where she was and who was around long enough to say "My God, I never imagined that a hit to the balls would hurt this much." immediately realizing her mistake and looking at Mrs Carson, who heard everything and went straight to her.
"Have balls? No, it's not possible. I know you're a normal girl, I've seen you through your physicals." Ms. Carson said and due to her curiosity, she didn't hold back and put her hand on Alyssa's crotch, clearly feeling her cock through the fabric and pulling back quickly. "You have a dick and it's real thing. But how?"
"It just happened. I had sex with another girl who also had a dick and mine grew soon after. It looks like it's contagious." Alyssa said
"I need you to accompany me. Come with me." Mrs Carson said and grabbed Alyssa by the arm, forcing her to follow her
Alyssa tried to escape saying there were people waiting for her, but Ms. Carson didn't let go and insisted that her friends would understand the situation.
They got to Ms. Carson's car in the parking lot, which they got into and drove to the teacher's house. There Alyssa was taken to a room that was equipped to look like a mini lab, it wasn't complete, but it had enough to do some studies.
Ms. Carson questioned Alyssa, wanting to know as much as she could about her change, and the student didn't want to, but eventually ended up telling most everything she knew, refusing to say who had passed it on to her and the source of her change. The teacher then came to the conclusion that she would understand better if she went through the change herself.
Alyssa, knowing what that meant, refused to fuck Ms. Carson, but the teacher took hold of the seat she was sitting on and sat on her lap, and then began to move her hips. Alyssa tried to resist, but the teacher was more experienced than her in the area and knew what she was doing, so soon her dick was hard under the teacher's ass.
Satisfied that she made her student very horny, Ms. Carson stood up, undressed, lifted Alyssa's skirt and freed her hard cock from inside her new panties. "Preparations ready. Now I want you to fuck me. No need to worry about me, I'm doing this willingly and also in the name of science. If I have to sacrifice my pussy for that, that's a price I'm willing to pay. Now I just ask that you don't hold back with me." she said
Alyssa took it and then fucked the teacher. She didn't even want to know anything. Ms. Carson wanted that, she'd been seduced into using her masculine tool so that's what she did. Fucking her teacher's pussy she liked the feeling of having her cock inside a pussy. She started to think that it was okay to have a dick, to fuck someone who was willing to be fucked by her knowing the consequences of it. She held on to it to last as long as possible because it was too good for her and she knew that shortly after she came that pussy would cease to exist and she didn't know when she would find another girl willing to be fucked by her. Soon Alyssa came inside her teacher's pussy, filling her with her cursed cum.
After having interrogated Alyssa so much, Ms. Carson, having an idea of what to expect, got up quickly as soon as she felt the first discomfort inside her belly and sat down in front of her computer, where she quickly typed in describing everything about the change process. She was excited like a kid who just got a new toy, going almost crazy with happiness when her new cock started to come out of her pussy, already hard and pulsing with excitement as it revealed all of its 11 inches, followed by the by her pussy inverting itself into a sack, which was soon filled with a pair of golf-ball-sized testicles.
Alyssa had been satisfied after coming and if she now felt uncomfortable witnessing what Ms. Carson was doing, so she took advantage of her distraction to get dressed again and try to slip out unnoticed, but she found she was locked in there and couldn't get out. With no choice she asked to let her out, but the teacher ignored her and just started jerking off not caring that anyone else was there and what they thought about what she was doing.
Ms. Carson had an idea and stopped jerking off, got up and went to a cupboard where she picked up an empty lab vial, which she handed to Alyssa asking her to keep it in place. Her student held the bottle where she asked and so she returned to stroke her newly acquired cock, doing so until she felt her orgasm approaching and then aiming her member against the tip of the bottle and coming. After orgasm she capped the bottle, which was now half full with her cum, saying she would analyze it later, and went back to the computer where she wrote a note describing the differences between a female and a male orgasm.
Alyssa had no choice but to wait and only after Mrs Carson was satisfied was she released to go home.