Monster that naturally takes so long to cum that finishing after several hours would be considered abnormally fast for it
When it first catches you, it’s too strong for you to fight off. Your only choice is to just endure its oversized cock until it stuffs you and lets you go. But you keep enduring, and enduring, and enduring, and the monster never shows any signs of stopping. After it’s fucked countless orgasms out of you, it hasn’t even had one. If there’s a clock nearby, you might be able to tell that you’ve been getting used as a toy for hours and hours, assuming you can still think about anything other than monster dick
You can’t endure forever, as the constant railing exhausts you till you can’t move. And with one more orgasm you finally pass out. The monster’s not satisfied, though. It doesn’t pause for even a second as it continues thrusting away into your unconscious body. You don’t get to truly rest, and eventually you’re woken up by the same rough thrusting that knocked you out. It’s been nonstop for a full day now.
When the monster finally starts to speed up, getting close to finishing at last, even that takes a long time. Even rougher than before for almost a full extra hour before with one more hard thrust and stuff your insides with its seed. One pump at a time fills you fuller and fuller. It feels infinite, but finally it’s done and you get a chance to rest. Well, until you feel its cock throb inside you again. You don’t even have the strength to complain as round 2 starts
