The two went on for hours, until Tails was equal in size to Sonic in every way.
However, rational thought has left their minds. All the two know now is sex.
The two both got on the bed, in the position known as 69. They sucked each other off, fingered each other, and facefucked for a few hours.
This forced the energy to spread far more than it originally was. Their height grew to four feet, their two, foot long members were now three, two foot long cocks, constantly erect and ready to fuck. Their breasts had begun to constantly lactate large quantities of milk, and had expanded to J-cups, all impossibly easy for the two to lift with their newly gained powerful muscles. Their balls had also enlarged, each of the four testicles being about 10 inches in length, allowing them to produce gallons of infective cum for every orgasm. Their fur had grown out wildly, giving them a beastly appearance. . They had gained a tongue of several feet, with the flexibility of a snake, allowing oral penetration as far in as they could reach. They were no longer Mobian. They were sex beasts who could think of no more than to fuck and be fucked.
After several hours of fucking each other, the two suddenly got up. They smelled a strange, new prey...