She realises she wants to

As Lisa squirmed beneath her monstrous lover and his three thick fingers pressed against her she initially felt fear. He would hurt her, tear her and break her beyond repair. But then he spoke, truly spoke! He had been learning from her after all. She knew this of course in some small ways - his general gentleness and demeanour towards her, their nocturnal adventures outside the cave. But to speak... that changed everything.

She unconsciously spread her legs wider as these thoughts flooded her mind. Perhaps she had gone mad, she didn't even know how long she had been with him but he was her reality now, her whole world, and as she writhed beneath him, one big mitt groping her breasts while the other threatened to split her wide she realised she wanted this. She wanted him. She wanted to keep teaching him and she wanted to reward him with her ultimate prize.

Lisa looked up into his big, black eyes and shook her head. "No, not hurt." she said softly. "But gentle." she added.

The beast growled softly and pressed two fingers back inside her, just a little. She realised he knew what he was doing as he spread his fingers slightly, stretching her further before he slid in the third. It hurt and Lisa yelped in pain causing him to pause instantly but Lisa shook her head once more at him. "Ok." she whispered. "More."

He grunted again, pressing in deeper as Lisa bit her lip, trying her best not to discourage him. He pressed in slowly and she stretched painfully but eventually he had them all inside her, holding them deep as she moved her hips slightly, getting used to the sensation.

There was no denying it hurt like hell, her slim frame was not built to take something so large. Yet, to her surprise after only a few mintues the pain began to subside and her body seemed to accept the intruding digits rather than try to actively expel them. Sensing her relax, the monster began to slowly ease out of her, Lisa feeling the pressure release on her inner walls bit by bit until he popped completely out of her. She had never felt so empty and through her ragged breathing there was only one thing she could say.

"More."

The beast obliged, pressing back in deep. Lisa felt a sharp pain as he entered her, but once inside her pleasure began to build and soon he was sliding his fingers in and out of her rapidly. She took much longer to cum than normal which the beast must have noticed because eventually he pulled completely from her, then surprised her by repositioning and burying his face between her thighs. He licked and lapped at her throbbing, broken folds and buried his tongue deep inside her, the sensation too much to take as she came explosively.

As quickly as he had removed them, the monster returned them, his digits pressing back into her now pulsating tunnel and pushing back in deep. Lisa wailed as she felt another climax immediately hit her, her inner walls clenching tightly around the impossibly big intrusion causing her eyes to roll back in her head. He held them inside her until well after her climax had ebbed away, eventually sliding them out with a very sloppy sounding plop.

Lisa was in a daze for a long while after that but once she came to she rewarded her lover with every trick she knew, but this time she added something extra. Having used her tits and mouth to bring him close, Lisa climbed atop the sitting beast, straddling his thighs as she pressed her broken cunt up against the base of his enourmous phallus. Feeling her wetness against him elicited a groan from the beast, Lisa gently sliding herself against him as she resumed sucking.

It only took about a minute of this for the beast to cum, Lisa feeling it with her cunt a split second before a torrent of his seed exploded into her mouth. She guzzled it down hungrily, her own sex pulsing wildy as she too came, her thighs clenching tight around him as she creamed over the base of his cock.

By the time she climbed off him they both knew what they truly wanted. It would just require a little more training.