The veins in your massive cock feel like they're pumping as much blood as your arms, and while the size is thrilling, you are eager for the potion to wear off. It's so heavy! You walk over to the woman as she moves to lie along the cushioned bench. "No foreplay today," she says softly, "the potion was all we need."
You climb on the cushion and position yourself well below her. The top of your enlarged penis is so displaced that you have to enter her with your face positioned below her breasts. She smiles as you plunge into her. You crawl upward along her body, dragging your huge penis along with you, moving deeper and deeper. Every inch you move into her makes you shudder with excitement. Your giant shaft pushes through her body, alive along its entire length, and excited around its entire girth. You expect to hit the top prematurely, but you enter all the way until your thighs touch hers.
You look at the woman, worried that you've hurt her, as you feel a bit like you've just stuck your entire leg into her. But she smiles, that wicked hungry smile, looking ravishing in the colored lights and the room's haze. So you lie against her and begin to thrust. It feels good, but you remember what you came in here for, and you reach around her hips and clutch her big, round butt in your hands. Every part of your body feels glorious as you touch her whilst in the throes. You caress her as you thrust, sometimes stopping to adjust. The size of your dick makes it awkward to manage, but you find a way.
After a few minutes, she climaxes, so you let yourself go, too. As you crawl down her body, sliding your long shaft out, you can feel it begin to retreat, and you can feel her becoming tighter. You sit with the woman on the cushions, feeling both exhausted and also exhilarated by the event. Your penis shrinks in your hands, as slowly as it grew. As it retracts below your navel, you are glad to be back to normal size, but you also wonder if there is a potion for being just a little larger.
The woman looks at you and smiles again, that strange, hungry smile. "That was marvelous. You have an aura that I desire, and I hope you will stay and do that again, regular size."