You explain it to the two of them as to what it would mean to get bigger boobies, aka butt humping, as their reactions are suitable adorable and horrified. They both lean back, wide eyed and ears down, as you talk about how you butt humped their mother to get the ritual to complete. Neither of them wanting to wait things out, getting the chance to get smoking hot bodies off of your perverted magic, as Lisa perks up and tries her best to be brave.<strong>"nyaaa, if it means getting bigger boobies then you can...um...butt hump me....nya..."</strong>Blushing hard at that as Nina is horrified by what her sister just said. Blushing furiously herself but not so eager to have her butt humped by some perverted puppy, even one that has such an amazing cock as you have...