You take too long thinking, and feel overwhelming sexual urge overtake you... You realize your cock has deflated, and in fact is shrinking. Soon your cock and balls all slide into you, forming a new feminine opening between your legs. Understanding hits you for one moment before you start panting and whining for a male, launched fully into heat.
You're a bitch, and you find yourself aching to be mounted, to feel a stud's knot thrusted deep inside of you!!!