Cole let out an exaspered sigh and adjusted his waistband to keep his boner tuck against his body so that he could walk back to his room discreetly. As soon as he stepped out into the hallway though he heard his mother call.
"Cole, Melissa! Dinner will be ready soon, you better come set the table now! I'm not yor maid, kids."
There was no way Cole would escape his mother's insistance long enough to take care of his problem. Defeated, the teenager walked to the kitchen, trying to act normal, his swearshirt loosely falling over his growing chest and covering his erection.
"So, how was your day honey?" Cole's mother asked.
Cole indulged his mother with the small talk, hoping that would distract her. Of course he did not mention his recent changes caused by the salve, let alone the swimming pool and breast growth. When questionned about his "girlfriend", he tried to remain vague and made up some details; she was this new friend at school, they were working on a science project together. He had not asked her out yet, but might soon. His mom somehow seemed very invested in her son's possible first serious relationship, but eventually let go of the subject.
Melissa joined for dinner, and Cole noticed she too was wearing baggy clothes; now he knew why. The image of Melissa on all four with multiple breasts jiggling together was seared in his mind. He spent the whole meal shifting uncomfortably on his seat, trying to keep his boner from poking from inside his sweatshirt.
As soon as he could, Cole left the table to masturbate furiously in his bedroom, discarding his clothes. The moments of the days merged as a blur in his head... Waking up this morning with breasts, then being found out by Sam, Sam coming out as trans to him, and then exposing Sam to whatever was in the swimming pool that provoked the feminine changes... and now of course, his sister's mutated body too. All Cole could think about was sex and breasts.
Feeling his dick take on a canine shape and lenghtening even more, he quickly found himself getting close to cumming in under a minute. But it was not enough. Then the idea struck him, and he bended over his huge member and directed the tip into his mouth. The idea of temporarily getting better breasts and a girl's body was incredibly arousing to him in the moment, and he worked himself until his balls started churning and his mouth filled with his own mutant cum.
Moaning around his canine glans, his cock throbbed so wildly that Cole had to let go, swallowing down what he could. One last rope of thick semen shot in the air, which partly landed on his chest.
A few second passed, and Cole felt the characteristic electric tingle run through his body. His bones cracked a little as he took on a slightly smaller, feminine frame, and his breasts rapidly swell. Simultaneously, he felt his penis soften and shift, looking more and more like a giant clitoris at it shrank, until it was a normal size above the lips. His inside rearranged slightly to accomodate for a vagina.
Cole jumped on his feet and let out a girly giggle in a feminine voice, swaying his hips a few times to feel his breasts jiggle with his moves. He then put on his pyjama shorts and t-shirt, feeling cute in a tomboyish way. He wondered what Sam was up to right now.
He grabbed his phone and laid on his belly on the bed cover, typing a message...