Disclaimer: JK Rowling owns all of this but I'm having fun playing with it!
Author's Note: I feel like I understood why JK Rowling left us with so many unanswered questions at the end of Deathly Hallows. How could she have just returned Harry to normal life (particularly a normal love life!) after the death of so many beloved characters? I waited a while to allow the dust to settle and picked up with Harry just before his eighteenth birthday.
The resemblance between Harry Potter and the little boy in his arms was uncanny – his untidy black hair, his bright green eyes, even the lightening bolt scar just under the little boy's hairline. Harry knew from the half-photo he retrieved from Sirius' bedroom that this was exactly what he had looked like at Teddy's age.
"You're no good at sleeping or staying clean but you'd take out every prize in a look-alike competition. I'd better be sure not to lose you in a crowd of house-elves, I'd never find you again!" Harry blew a noisy raspberry on the boy's stomach and smiled as Teddy collapsed into giggles, his appearance changing rapidly as he laughed.
Harry put Teddy back down on the rug and prepared to return to their usual game of cat and mouse around the boundaries of its hem. Harry's determination to keep him close always seemed to clash with Teddy's determination to be free.
Looking across the garden Harry saw Molly Weasley and Andromeda Tonks talking together quietly near the pond, each regularly dabbing their eyes with their handkerchiefs as they spoke. Harry was glad that Andromeda had Mrs Weasley as a friend, they had both lost so much. He also knew that he'd been a great help and comfort to this recent widow and sudden single parent, but Harry's real motivation for being there was spending as much time as possible with his little orphaned godson.
Andromeda had needed so much assistance in the first month after Voldemort's defeat that she had given Harry the keys to the flat out the back of the large house she had shared with her husband before his death. She and Ted had built the little house for Tonks and Lupin just after Teddy was born in the hope that their daughter, son-in-law and grandson would be able to come and spend time with them should peace ever return.
At first Harry had thought it would be hard to live in a place intended for his departed friends but after a while he began to love his little home and love having the opportunity to live in his own space. Six years of dormitory life at Hogwarts and a year in the close confines of a tent had really made him long for some time to himself and now he had just what he needed. He was able to be there for his godson in a way that his own parents and godfather had never been able, he could support Andromeda in her grief and ensure that she wasn't alone and he still had plenty of time and freedom to see his friends.
Harry lay back on the rug, hands behind his head, deftly cutting off Teddy's most promising escape route. Unperturbed, Teddy began to clamber over Harry, painfully digging his little fists and knees into Harry's defenceless stomach. Harry rolled over laughing, wrapping himself around the little body that immediately focused all its energy on a wriggly bid for freedom. As he unfolded himself to get a better position he looked up and saw that Teddy had suddenly and drastically changed his appearance. Teddy's newly soft brown eyes and growing long red hair prompted Harry to look around, finding himself staring straight into the eyes of Ginny Weasley.
"Hi, Harry," she said quietly.
"Gin! Hey Teddy, it's our favourite girl!"
Ginny blushed and Harry worried he might have pushed his luck; there was still so much unspoken between them. She sat down on the rug, so Harry concluded he must not have gone too far wrong. He sat up and gathered Teddy into his lap so that he could give his full attention to this new arrival.
"How are you doing, Gin?"
"I'm ok, I guess, no worse than Wednesday," she gave a slight smile.
"Was it only Wednesday that I last saw you? It feels like it was ages ago!" Harry quickly realised that his words hinted at a truth he didn't think Ginny was ready for yet. He covered his mistake. "Time goes by really fast with this little chap around!" An emotion Harry didn't feel game to try and identify flickered across Ginny's face.
"How's George?" Harry asked quietly.
Tears came to Ginny's eyes and before Harry even thought about it, he had reached over and taken Ginny's hand. As soon as he realised how forward he'd been he also realised that he couldn't just pull his hand away. He'd have to surreptitiously get a look at her face to find out her reaction. Ginny was quiet for a moment. Then she gently began to stroke the back of Harry's hand with her thumb. Too afraid to look up at her, Harry tried to force his brain to work out whether or not this might suggest that Ginny was ready to receive more in the way of romantic gestures from him. However, before he could come to any conclusion, Teddy had flung himself onto Harry's outstretched arm forcing him to pull his hand away from Ginny's. She was laughing by the time Harry could finally look up at her so he could make no further progress down that particular avenue of investigation. Nevertheless, this rare laughter was welcome, and Teddy would provide plenty more opportunities for her to keep up that behaviour.
Molly called from across the garden, "Ginny?"
"Mum? Are you heading off already?" Ginny asked. "I was thinking I might stay here with Harry this afternoon until he comes around tonight. Is that ok?"
Molly looked over at Harry who couldn't believe his luck. "Will that be ok with you, Harry?"
Harry practically shouted his response in his enthusiasm "Absolutely! Gin and I can hang around here and then come through the Floo to The Burrow this evening in time for dinner."
Mrs Weasley went back into the house with Andromeda to say her goodbyes leaving Harry and Ginny alone with their little charge.
"Thanks for staying around," Harry wasn't sure what else to say. He had been so hesitant to request