Keep pretending to be asleep.

Rubbing against him while he's asleep is one thing, but now he's awake it's another. Getting an erection for his **** isn't exactly something Ulfric would be proud of and if he knew you were awake, he'd almost certainly be embarrassed. Instead you relax and see what he does.

The grinding continues; slowly and gently he rubs his cock against your backside, clearly fully hard. Even through the layers of fabric, you can tell your master has a dick to be proud of, certainly larger than your own modest manhood. The rubbing gets a little quicker and Ulfric's breathing gets heavy...is he? Your question is answered when he tenses against you and holds his breath. A brief shudder marks his climax and he slowly releases his breath in a long satisfied sigh. The smell of cum confirms that he has just unloaded himself against you. He stays lying against you for a while before rolling over, his hand briefly cupping your buttock.

You want so much to release your own load, but daren't risk letting him know you were awake for what just happened. Instead, you do your best to settle down and get back to sleep.