Fuck!Craig had ordered a dose that, according to the website, would change the women in his household slowly. He hadn’t wanted a sudden explosion of... tits and incest to incite uncomfortable questions. But Shelby clearly didn’t think she was changing fast enough. He went back to the website and read the fine print.“Overdose of Vitabims can result in extreme bimbofication. Side-effects vary widely and may include, but are not limited too, semen addiction, uncontrolled masturbation, subverbal. Fuck me. Grab my hips and make me scream."Not to disappoint, I gripped her hips tightly, withdrew nearly my full length, and forceably drove into her."Aaaaayyeeeeeaaaaeeeeaaaa!" She cried out."Oh my god, I'm so sorry. I-" More. Fuck me harder!"At her demand, I cut all caution, and started pistoning into her asshole. Mom called out encouraging things in between mouthfuls of cunt and balls. The basement shower echoed with her screams, as I pushed deeper into her bowels again and again. Mom. Come see me in my room," she then added, stepping out, toweling off quickly, her wet soggy clothes still laying inside the shower stall. She didn't even bother picking them up, taking them with her. I heard the gentle close of the door behind her as she left the bathroom. And I stood there, looking down at my still slightly stiff member, trying to convince myself that it had actually really happened. And then wondering ... what the hell I had done, what she was no doubt now feeling. I could. They all had about the same size cocks so we sort of worked out it was a bit different because they had different ways of doing it but it was still good. Tony then said before anybody cums we should swap again and that way all of us would know what it was like fucking different girls.All the girls said ok and didn't hesitate and then the boys all swapped girls and we were all having sex with the third boy. In my case it was Janes guy Tony, he had probably the biggest cock of the three of them.