As you sit underneath your teacher, your erect cock straining to get into her, a naughty idea pops into your head. You can do anything, so you might as well try! Moving your teacher off of you (with some effort) you stand her up and pull her leggings all the way down, as well as her thong, and you remove your underwear and discard it to the side. You step close to her, and stick your feet the ought the leg holes of her leggings and thong next to hers. "Pull them up" you command, and she complys, bending forward and pulling the leggings and thong up around your legs and hers. You give the thong and pants a tug or two, making it big enough to fit you and her, as well as making the leggings into grey yoga pants. Now for the fun part. You rub your hands down your legs, and feel the fabric smoothen out as all the hair dissapeared with a slight tingle. Next, you put imagine filling your hips and butt with fat as you placed your hands on your rear. The fabric of the yoga pants had shown your male butt, but quickly the fabric stretched as your rear swelled. You moan slightly as your butt inflates into a massive heart shape, your hips jutting out leaving you equal or greater in size to your teacher. A similar reaction happens with your legs, with them plumping and lengthening to fit the pants. your dick and palls were tucked inside your teachers ass, and two any outside observer it would merely look like a teenage boy and a grown woman shared an enormous curvy lower body. You moan as new nerve centres sent shocks of pleasure to your brain as your juicy caboose was squished by the pants. The teacher walks around the class, teaching and helping students while you tagged along, blushing as you felt the states off every guy (and a lot of girls, too) drill into your alluring rear end. As your teacher bends over again, showing off your asses to the guy behind you, you decide on what to do next.