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He watched and waited for there to be a peaceful moment after all was said and done, when little Rhea could slip away and not be worried over for the next however many days what he was about to do would take. The moment that came up he followed after her. It's surprising how easy it was to go unnoticed when he was chasing after her, then again he was unnoticed when he delivered her letter. He hated this part of his biology. He was going to break her trust in him over this, he knew.
Once she had gone through the floo Hagrid went out to Hogsmeade and summoned the Knight Bus, which still sucked and he means it this time when he says never again, and made his way to Grimmauld Place and found the right house and knocked.
The door was opened by a dour House Elf.
"What does a savage Halfbreed want with Kreacher's Mistress?" Little blighter is to the point isn't he.
"You know what." And he would, House Elves are able to see all the bonds of their masters, it's how they know which child is a scion of the House and which isn't and so on.
"If the Halfbreed causes more harm than needed, Kreacher will ensure his head is taken from him." Hagrid nodded in acceptance, that was fair, giants have been known to get lost in the throes of the mating that they injured their mate grievously, he'd like to think he wouldn't, but it's never a sure thing.
He was let in and taken to his little Rhea, who was currently in the shower. Hagrid, not able to fight it any more shucked off his clothes and stalked into the steamy room silently, his cock harder than even when he fantasized about this very moment. His hands slid around Rhea's wet body and pulled her back so she could feel his cock on her back as he spoke.
"I can't fight this anymore Rhea, so I'm sorry, and I'll make you feel so good."
And then he moved, picking her up like she weighed nothing, which she did and pulling one leg up and apart from the other so his meaty fingers can prepare his tiny mate for his massive cock. One large finger rubbed circles on her tiny clit, dipping down to collect some of the slick that was beginning to drip out of her and spread it over the sensitive button. Then he slid the first of four fingers, that was how girthy he was at his largest and he will be buried all the way in if he had anything to say on that matter. He pulled two orgasms from her on his fingers, one on two and the other on all four that he needed to stretch her properly.
With little preamble he stuffed his cock in and growled when he had to stop, how dare his mate not recognize his cock immediately and open up all the way. That was fine, he'll just make her open up all the way, then he'll hope it takes the longest for it to take, he wants her desperately dependent on him. He then set a punishing pace that bullied himself the rest of the way in and his tip like three inches into her womb when his Rhea's tiny cunt began to strangle his cock making his tip flare before he began his flooding of her cunt with his cum with a bellowing cry of victory.
Once the haze passed some, Hagrid carefully helped his little Rhea finish her bath and then dried her off before getting out of the bathroom and through the door that was conveniently left open for them and settled in a plush chair that must've been resized to fit him. Sitting like this he could rest his cheek on her head and rub his hands over her slightly bulging belly, over where his large flared cock was stuck pumping his cum continuously until she was loaded with it and it took. So he did.
Hagrid felt her trembling and smelled the salt of tears so he carefully reached over and grabbed the comb that Kreacher seemed to have left on the little side table next to the chair and carefully began combing through Rhea's hair.
"Why?" Her soft, woeful voice damn near broke his heart as he carefully untangled her untamable tresses, the little sniffle almost made him regret giving in.
"Giants have Mates." He started, deciding that it would probably be best if he didn't try to soothe her emotionally after what he did. "There is no courting, or anythin like that. Just the Waitin, which happens when a mate is too young, and the Takin, which is what is happenin right now. Physically Giants differ from wizards in a certain way, their ... you know what flares at the end, and when the Takin happens it keeps it and the... stuff.. from going anywhere else than where it will take. I'll not be able to leave your .... you know where until it has taken."
"But why me?" She almost sobbed so he pulled her closer completely surrounding her and gently made soft circles over her clit with one of his large fingers.
"I've known you were mine since we flew out of Godric's Hollow." He let his other hand drift up and cup the small to him mound in his hand with a soft squeeze that had her gushing on his cock and easing around him just a smidge. "I decided to Wait until you've had a few sprogs with a normal Wizard, let you have a normal life before I ruined you for any other man. But then I watched you die, Rhea, I held your limb lifeless body and I just broke my sweet bird. And then you weren't dead and I couldn't wait again, not when- so here we are little bird."
"What does this mean?" Oh his sweet bird.
"Well, it can become one of three things. The first is a relationship like my parents had, where after it takes I leave and we never have to see each other again, even if by Giant standards we're one, more so you're an extension of me, in the eyes of the law we're not wed and it won't affect your standin too much when everyone sees that your baby is part giant. They'll just think you're kind or somewhat." He paused to let the building climax fall through her before continuing. "The second is, I leave after it takes and come back when you're healed up enough after and repeat this to a smaller degree, which would be less driven you'd say, 'cause I won't be needin to claim you as mine, and the process won't be so, er, drawn out as it were since your magic will be helpin things along. And the third is I do right by you and marry you good and proper."
"When?" He hummed in thought a moment before answering.
"It'll take when it takes." He trusted up a little savoring how she milked him just so. "Just let me take care of you."
It took a week for his seed to take, which was enough time for him to fill her out to the size she might be at six months along for a normal set of twins. It was the middle of the night and she was asleep on him when he finally stopped cumming and slowly began to go flaccid, his cock receding and softening until it rested limply in her cunt with the door to her womb shut tight. He carefully pulled out of Rhea and staggered to the ensuite where he grabbed what he needed to clean and heal her as needed. And carefully tended to her before tending to his own needs and tentatively asking the House Elf if he would bring them up some tea and easy to eat things that won't uspest Rhea's stomach too much. He found his pants and forewent his trousers and he carefully put his own shirt on her.
Hagrid returned to his chair and waited for his little bird to wake up anxiously. She might hate him.
An hour later she shifted and sat up tiredly and looked so small in his shirt he wanted to fill her up again. She looked so sad and guarded, like she was prepared to be told that he made the choice for them and it was the one that made her feel like a used rag
"So-" her voice was too rough so he carefully brought her a cuppa made exactly how she liked it.
"Take your time." He eased himself carefully onto the side of the bed so it didn't break from his weight.
"What was decided?" She lifted her chin up like she was facing more trouble and it hurt his heart a bit at the thought that he was the trouble.
"What do you want?" He asked shifting so he can kiss her if he dipped slightly.
"What?" And at this he remembered that his little bird had little choice in most things and it hurt more that he was taking her choice more firmly from her.
"What happens after this is yours to choose." He said simply. "I'll accept whatever you want. Even if I want to stay in your life, I'd understand if after this you want nothin to do with me."
"I- " Rhea drew up short like she didn't know what she wanted.
"You don't need to decide right now." Hagrid took one of her little hands in his and lifted it and kissed the tips of her fingers before continuing. "You have time to think, to breathe."
"I need to apologize to the Goblins." She straightened and paled slightly. Looking warily at the floor before carefully swinging her legs out standing only to be caught by Hagrid before she could truly fall.
"Write a letter first, have your Elf take it and I'll run you a bath so you can soak." He watched, almost enchanted as she bit her lip before answering.
"Will you be joining me in this bath?" She flushed as she asked this.
"If I did, little bird, I'd only be using my hands and tongue on you, is that okay?"
~12 years later~
Rowan Potter let his short, very pregnant mother fuss over him as his dad waited patiently for his turn to pull him aside and talk with him with his younger siblings save Rory who was too little and with Nanna Molly.
"Now son, when the time comes, you need to Wait. Ok?" That wasn't what the preteen thought he'd say at all.
"Okay." He agreed confusedly before getting on the train.
He hoped he'd figure out what his old man meant by the time he was sorted.