You are alone tied to your bed thinking of a way to escape and get back to normal. You then start to wonder what made you become a girl, but you were sure that whatever your sisters were involved in it.
After a few minutes of thinking you noticed a strange smell in your room, it was sweet and pleasant. You thought it best not to worry about the smell and went to wander in your thoughts, thinking about your sisters trying to imagine how they turned you into a girl, but your thoughts took another direction and when you realized you were already imagining them in erotic situations. You then shake your head trying to get rid of these thoughts, only to realize and your pussy was all wet.
You realized you were horny, but in your current situation you thought it wasn't time for that, so you tried to divert your thoughts, but you went back to imagining your sisters in erotic situations, as well as other girls. You were a little relieved that you didn't stop being attracted to girls, so you decided to test if your personality had changed and tried to imagine some man, but your thoughts always returned to the girls. By then you realized you knew that your sexual preferences hadn't changed and that being a girl you were now a lesbian.
As you thought your hard-on increased, you could feel your pussy wetter than before, It made you start to think that maybe it wouldn't be so fun to be a girl and that it wouldn't be a problem if you didn't go back to normal ever again, but you needed to fix your horniness and you were unable at the moment.
You had already been tied to your bed for two hours when your bedroom door opened and Lizzy walked in. "Are you calmer now?" she asked
"I think I am, at least I don't feel any anger anymore." you said
"Great, but it's still no use asking us to turn you back into a guy because we have no intention of doing so, at least not yet. Depending on how you behave we can think about it." Lizzy said
"I'm not going to ask this, but I'm really horny and I need to do something. Please untie me so I can fix this." you said
Lizzy made an expression as if she was thinking about it for a while and then said with a mischievous smile on her face "That won't be necessary, I can do it for you." placing her hands on her hips and drawing your eyes there.
You were surprised to see a bulge in her jeans from something that was in her crotch running down her right leg. You had an idea what it was, so you looked in disbelief at her face and said "This can't be what I'm thinking, can it?"
"It's exactly what you're thinking." Lizzy said. A moment later she unbuttoned her jeans and lowered them, releasing a hard cock, which rose so fast that it hit her stomach with a thud.
You watched your sister who now had male sex organs between her legs, she held her 9 inch hard cock while a ballsack three times bigger than the one you had was. "what are you going to do with it?" you asked her
"It is not obvious? I'll fuck you until I'm satisfied." Lizzy said and climbed onto your bed, where she pointed and pushed her cock against your pussy, penetrating you.
You couldn't do anything but let your sister fuck you while you were tied to her bed. At first you thought about complaining, but you realized you were enjoying feeling your sister's cock going back and forth inside you. It got to the point where she even enjoyed becoming a girl and wanted to give herself completely. You then asked Lizzy to untie you, which she thought for a while before granting your request. Now that you had your hands free you started to caress your breasts, then managed to take your nipples to your mouth and play with them.
It didn't take long for Lizzy to increase her pace and stop with her cock balls deep inside you and come, you also came feeling her hot white seed being deposited in your womb.
When her orgasm ended your sister stood up, and when she took her cock out of you, you felt an emptiness. You were still horny and wanted Lizzy's cock to stay in your pussy so you kept looking at her who still had her cock hard and had the last drops of cum from her last orgasm dripping from the tip.
"The aphrodisiac gas we left in your room is really good, I still have a lot of energy to go on." Lizzy said, making you realize what that sweet smell in your room was.