Fill Stacey up some more

With Stacey's breasts now fitting to what you want on her body you pick the marker back up and smile while she seems hypnotized by your cock, just staring at it, and playing with her pussy, which will now be at peak ovulation as long as the mark is there.

You contemplate what you could write on yourself and then grin as you look down and write "ALPHA" on your arm and then show Stacey, whose eyes dilate further and she cums all over her fingers.

You feel a burst of energy and hormones as your body fills with testosterone, and confidence. You smirk down to your girlfriend knowing that she will do anything you ask of her, and never question it both because of the size of your cock, and because of your new power over weak willed women.

You look lean down close to her and grin, "Spread those legs baby so I can breed you right." She moans and lays down on her back with her legs spread wide, "OK baby. I'll spread my legs, but you can't exactly breed me when I'm on the pill."

You slip down and enter her tight, hairless slit quickly, and easily, her orgasm having slickened her pussy up nicely. You grin and shake your head, "Actually, I made a quick change before to ensure that your birth control wouldn't be a problem anymore...and that you are always ovulating."

Stacey wanted to be mad, and started to get angry, but then she realized that Finn was her Alpha now, and if he decided that she was to be fertile and ready, then she was just to be fertile and ready. "Oh...OK." Her voice was meek and aroused. She wasn't personally ready to have kids yet, but that decision wasn't her's to make any more.

You start fucking into her again and again, pounding her elastic pussy until she is just moaning and cumming like the fertile little girlfriend you've created. Her pussy is clamping down on you, coiling around your cock, knowing exactly what it wants as you hammer against her ripe and waiting cervix.

When you cum again this time, you explode into her depths, half of the head of your massive cock inside her womb so there is no possible way her awaiting egg (or eggs) have escaped your potent Alpha seed.

Stacey looks up in awe of you, as though you have just completed her life's purpose. She would happily be bred by you a thousand times if it meant you mounted her like that again. She clung to you like a **** koala, and you collapsed onto the bed next to her, with one final command, "Don't use the marker without my permission and don't tell anyone else about it either."