Emily thought for a second and then said "Ok... let's try this." and then her form started shrinking. Her clothes getting baggy before I could get a better look. She was becoming her 12 year old sister she told me she had but I don't think I ever saw her. However this small shrimp would probably be her little sister... or it could've been Emily as a little girl or maybe her mother as a little girl who really knew? She seemed kinda cute though and in her "big sister's" clothes the way they draped over her slim figure. Her once V-neck's neck hole that once settled nicely between her chest gave enough of an opening as I stood over her. Enough of an opening that when looking above her it was easy to see that bra of hers lying a bit below her cute little pink nipples as only the buds of breasts were around.
As I was caught staring Emily she pulled her shirt up and startled asked "Why were you staring?!?"
I grinned and said "I mean you're cute, and we both have just started puberty so I must say I felt really curious."
Emily said "So you find me sexy?... Jason?"
I tried to think of something to tell her that wouldn't sound like lying and said "Well I want to have sex with you..." Emily glared for a bit and then grabbed my hand as we went to her room. She then closed her room and shook her hips a bit to make her skirt fall to the ground, and said "So are we going to do it like this?" She seemed a bit unsure of herself, but she consented and seemed to enthusiastically so that was enough for me to take off my shirt, and pants and they both jumped on her bed which was more than big enough for their smaller bodies. Their younger brains were so excited they just went and for the sex as Emily also quickly took off her shirt dress, bra, and panties as the two went straight for the penetration. As Emily's sister was a virgin she gasped in pain, but it quickly turned into pleasure as she quickly made a small modification. Her pussy was so much tighter, but then again my dick was smaller so there was less to squeeze. Then with so little breast to squeeze I played with her nipples a bit and her small squeaky noises were a weird cute yet sexy sound that just made me want to fuck her some more. I shot my load and then the two of us cuddled for a bit before the euphoria left off. We were heading to get our clothes back on when Emily's bedroom door opened to show...