A fantastic commission from RunetheOtter

You go to bed one night and then wake up in a fire-lit cave. You are lying on a bed of furs and discover, to your shock, you are completely naked. You also discover you are not alone as you feel furred heat from a large anthro mammoth, wearing only a loincloth, hugging you from behind. As you stir in your surprise, you alert the mammoth to your awakeness. He turns you around in his huge arms and hugs you to his big belly. You feel warmth and affection in his touch. Yet you also feel dominance emanate from him. He looks in your eyes as you look back at his and you immediately know his intent in the seriousness of his gaze: he has claimed you as his mate. And he aims to demonstrate his claim of you by breaking you in and showing you his love.

He reaches downs to his crotch and swiftly discards his loincloth before hoisting you up from your armpits and lifts you forward so he can place your butt to his mouth. You are practically sitting on his face. He proceeds to lubricate your hole with his warm and wet tongue, sending hot, electric sparks around and in your anus. You moan in bliss thus encouraging him to lick deeper to your increasing pleasure. After a minute of this, he yet again lifts you by your armpits and gently lowers you on to his massive, firm rod all the while staring in your eyes with that same stern gaze - he is going to take you whether you want this or nor until you both reach ecstasy...