I wrote this alternate ending as part of the original story but didn't think it worked well overall. I've included it here just for fun. It picks up just at the end of the sex scene. Enjoy!

"C-c-um!" she panted "Inside me! Please!"
"You sure?" it was all he could do to hold back after that last pleading statement.
"Please!" she screamed "Fill me with your hot cum Link!"
And that was all he needed. With one last thrust, he buried himself inside her, the head of his cock pressed firmly against her cervix and came. A spasm of pleasure coursed through him with every spurt of cum he shot into her womb. Saria orgasmed again at the sensation, her walls tightening around him trying to coax yet more cum from him. They both moaned each other's names, basking in the other's orgasm. With every throb of Link's cock, more cum flowed into Saria until finally he pulled out.

He stood over her, panting with his cock resting on her abdomen where moments before it had strained against the confines of her insides, it twitched on her stomach, their combined juices shimmering in the sunlight. Saria's pussy quivered occasionally, still yet to return to its previous size, gaping slightly with a slow trickle of cum flowing onto the forest floor. She lay beneath him limply as feeling returned to her, a dull ache filling her entire body.

Link continued to gaze down at her petite frame, limp from exhaustion. Saria's tousled hair had fallen into her face a little and been slicked down messily with sweat. Her small nipples strained against the fabric of her top, her small breasts still rising and falling with every deep breath. He was transfixed by her small, exhausted, sweat covered body and his arousal persisted. His cock rested against her stomach, still as hard as it had been minutes before, even as his last load dripped slowly from her.

Link reached down, grabbed Saria's legs and lifted them until she was bent almost in half, her knees by her ears.
"Link?" she muttered weakly "What are you doing?"
"Surely the Hero of Time deserves both?" Saria's eyes widened
"No, no, not right now Link." he ignored her weak pleas and began to position himself against her opening again, this time lining himself up with her asshole. The juices still covering his cock quickly coating the outside as Saria shifted weakly against his grip. He slowly began to push inside her again, Saria's feeble cries continued as she tried to wriggle out of his grip, Link held her legs down as her tight ass yielded before him. Saria cried out in pain as he pushed into her but Link was no longer listening to her. Saria screwed her eyes shut, tears leaking from the corners as she felt Link force his way inside her, slowly inching his thick cock into her. Once again her body stretched to accommodate him, with the juices from the first round acting as a lubricant, Link forced his way into her, feeling her ass tight around him, until he had forced his entire length inside.

"Link!" Saria cried out "You're too big!" He finally looked at her face again. Tears streamed down her cheeks as she held his gaze. She knew she'd bitten off more than she could chew. She'd seen the anal pictures and diagrams and had always been curious but she hadn't expected it to be this uncomfortable.
Link held her gaze and began to pull out of her, only to slam back in again when he had reached halfway. She cried out at the sudden sensation.
"Fuck!"
Link continued putting pressure on her legs, holding them by her head as he began to fuck her hard, taking every opportunity to slam his entire length inside her. Saria felt her insides being jostled, her guts rearranged with every thrust. This was the only way he could fit entirely inside her and Link was clearly making the most of it. She continued to struggle against his grip, disentangling her arms to beat on his chest as much as she could.
"Please! Stop!" Link simply released one of her legs and delivered a slap across her face, she fell silent. The shock took all the fight out of her.
"Just fucking relax Saria." Link growled at her, he buried himself inside her and moaned. More tears gathered in Saria's eyes obscuring her vision. She went limp again as Link resumed his rough pace, forcing as much of himself inside her as he could at any given moment.

Her body began to react instinctively, soon she was feeling jolts of pleasure run through her. Small moans escaped her lips as she stared up at her friend who was currently using her as his own personal sex toy. One of Link's hands gravitated towards her slick pussy and he began to rub her clit with his thumb, sending lighting through her lower body.
"See? Now you're enjoying it." he smirked down at her as he explored her lower lips with his fingers, occasionally brushing against her clit causing her to squirm against his touch.
Soon she felt the familiar sensation rising in her again, she could feel her body getting close to the edge without her permission. The tears clearing from her eyes she began to pant, feeling her stretched pussy tense.
"That's it, good girl." Link teased, his own climax approaching quickly "Cum for me Saria."
His sultry, slightly menacing tone sent her over the edge, she moaned weakly as she came, her eyes shut tight as Link's attention returned to her ass, roughly pounding her as fast as he could.

The constant feeling of being full to bursting coupled with the aftershocks of her most recent orgasm left Saria shaking and groaning which only encouraged Link.
"Saria, you're making me cum again!" he moaned and Link withdrew from her completely. Before she could process the sudden emptiness inside her, he groaned her name and his cum splashed onto her body. Covering her stomach and chest, some managed to reach her face and hair as Link continued to cover her in his cum. All she could do was lay there, feeling each strand splash onto her, her body weak with exhaustion from her multiple orgasms. Some landed in her open mouth as she gasped for air and she swallowed it eagerly.
Soon Link's orgasm subsided and he collapsed to the forest floor. They lay there, both panting. Saria could feel the painful throbbing through her pelvis as feeling returned to her, both her holes were left gaping after Link's girth and she could finally feel the pain that had been dulled by the pleasure. Saria closed her eyes and drifted off.

Some time later, she found herself awake in her own bed. She sat up gingerly, a spasm of pain shooting through her body. She groaned and ran her fingers through her hair.
"Good morning sleepyhead." Saria whipped around to see Link hunched over on a chair next to her bed that was now far too small for him. She gave a weak laugh at the sight and Link joined in.
"I had fun earlier, even if it did get slightly out of hand towards the end." he chuckled
"Me too." it was Saria's turn to blush, even through the aches and pains she felt warm and fuzzy inside "You're really good at…everything." she mumbled, Link laughed again.
"Thanks, you're not so bad yourself." his smile quickly faded. "It all kind of got away from me as it went on, guess I'm not used to this body yet."
"It's ok, towards the end I started to enjoy it a little." While true, Saria inwardly thought that not letting Link get too worked up in any scenario in future might be a good idea. Link shuffled his feet.
"I shouldn't have lost control like that though." he said meekly. They fell into a pregnant silence.
"Could we…do it again some time?" Saria asked, not looking at him and bunching the sheets in her hands. He looked at her in surprise.
"You really want to?"
"Yes, we can work on your…control." she smiled at him. "Besides, I enjoyed being ravaged by the Hero of Time." Saria winked at him and Link blushed.
"We can do it again, but only when you're not as sore. Deal?"
"Deal!" Saria beamed at him. Link leaned over and pressed his lips to hers, taking her by surprise. She melted into his kiss feeling deep down that next time couldn't come soon enough

All my work is crossposted to A03 just in case it ever disappears from here.