"What?" you scream, "I can't be a bimbo, why couldn't you make me a normal girl?". Your sister giggles "Well that wouldn't be fun and I dreamed of having a sister that I could teach all the stuff about how to have fun with guys, you like that idea don't you my little slutty sis?" You can't keep your mind off guys right now, no matter how hard you try, thoughts of cuddling with a strong big guy, having sex with him, pleasuring him in any way you can... You finally manage to stop the thoughts and sit on your bed, starting to freak out. "The mind changes are faster than I thought" you think to yourself.
Your dick is erect by now and it's 4" inches, "Hey, wait it was 6" all the time" you think but the horniness clouds your mind again, you mindlessly walk to your pc and look up pictures of big athletic guys masturbating and you can't help yourself and masturbate to them. You let out girly moans and whisper "Daddy" a few times, your sister just laughs, watching you succumbing to your desires. You finally come and with that your mind becomes a bit more clear but you still are somehow horny, you noticed that your entire chest is itchy and looks a bit flabby and your body hair got thinner. You see your sister and get angry "Why are you doi..." your voice cracked really weirdly there. "Like why did you this to me and stuff!?" you said back in your masculine pitch but in a really girly manner. Your sister just laughs and leaves the room, you decide to...