Let it play out

You thought you'd seen Chullian stamina in the past. But what you'd seen was nothing compared to two Chullians trying very hard not to cum.

At first they move easily, scooting you back and forth the little distance between them. But after about ten minutes, their movements become jerky, and they start breathing in little gasps. About fifteen minutes after that, Therion cums in your cunt, then storms off, swearing. Amano cums and locks you back up without saying a word to you.

At breakfast the next morning, you're still wondering what the hell that was about, but it doesn't seem like a good idea to bring it up.