"...my older sister."
You give her a weird look and say "I thought you didn't have an older sister. You're an only child right?" She laughs "Yeah, I know. I just wanted to see the look on your face. I was expecting more shock, but I guess that will do. Okay, now for your real change, I choose....." She sort of trails off, a look of growing shock appears on her face... "You choose what? Is something wrong?" you ask- the way she's staring at you is starting to give you goosebumps.
Her face never changes from it's jaw dropped expression, but she points to a nearby mirror...
Looking into the mirror, you find that your short brown hair has turned blond and is starting to grow down to the center of your back. You think you seem a few inches shorter, but you can't quite tell. With a slight squishing feeling that leaves you a little nauseous your waist tapers sharply and your hips flair. Finally, you're skin turns lighter, and you feel a sharp pain in both your crotch and your chest- although the latter's changes are more noticeable due to your expanding chest.
Your shock turns to annoyance. "Hey, I thought you said you didn't have a sister. Who the heck am I if you don't have a sister?" You notice your voice is high and soft.
"Maybe the room changed you into what my older sister would have looked like if I had one. You know, it might have tried to predict what she looked like, and that's who you are now. You are the sister I never had."
Looking down at your new form, you DO see some resemblance. Still this doesn't change the fact that she just HAD to make that joke that resulted in your current form. "Well, I may not like the situation, but I guess we'll just have to face the fact that you wasted your change for today." you say.
"Hey" You laugh and stick out your tongue at her. "So, I guess your going to be a snobby bitch like all older sisters I hear about. Well I guess I'll just have to punish you." Laughing, she suddenly chases after you
Laughing all the way, you admit this is actually turning out to be pretty fun. But after you had finished this thought, you get tackled from behind and land on the bed- she's got you pinned. She starts tickling you, and even though your still a little bit bigger then her, you can't help but laugh and beg for mercy.
As her tickling moves up your body. It's at this point you begin to feel a little awkward. Sure it's your girlfriend, but for a second it really felt like you were doing something dirty with a relative... But this can't be, can it? This girl's STILL your girlfriend... Isn't she.
As her tickling stops, you decide to try something . Grabbing her by the blouse, you pull into a kiss. As you two kiss, things begin to feel really weird. On one hand you know it's your girlfriend, but on the other you kind of feel strange kissing another girl... "Another" girl? Wait a second- what are you thinking... you're a GUY aren't you. A STRAIGHT guy! Kissing a girl is what straight guys are supposed to do... But it feels... off kissing like this the way you are... Specially since she's your younger sister... Wait... What?
After the kiss you both slowly move away, and remain silent for a minute. However, after a time you finally decides to break the silence. "So, did you feel like you were kiss your sister? To me if felt like I was kissing my little sister. This all is really strange. First I turn into a sister you've never had, and now I every time I want to do something with you it feels like....lesbian incest."
This was a very weird situation indeed.