A/N

This was an new idea for another Phineas and Ferb fic where Perry is alone because the Flynn-Fletcher family moved and left him but then Doof finds him at DEI and decides to let him live with him but then he also adopts Vanessa's young daughter as Vanessa doesn't want to be a mother but as time progesses, the three of them become a family.

It's a little angsty but will get happier as it progresses.

I hope people like.

It was a rainy day in Danville and Doof was feeling sad because he was lonely as he thought nobody cared about him but he then realised that Perry hadn't came at all but he then heard footsteps as he saw somebody was there as a sad smile crossed the turquise furred male as Doof saw tears in his brown eyes as Perry looked away from him.

"Perry is something wrong?

You can tell me, remember?" Doof asked.

"T-They left me behind." he said softly.

Doof had remembered hearing Perry saying that his owners were moving to Florida but he knew they didn't need him as Phineas and Ferb were nearly young adults and would stop inventing as they had families so Perry had nobody who needed him as Doof felt bad for him.

"Come here my little nemesis." Doof said.

Perry then sat on the couch in Heinz's lap as he couldn't fight the sadness as he needed to cry but couldn't.

"It's okay.

Let it out." Doof said.

He then saw tears fall from Perry's brown eyes as he was comforting him by rubbing his back and saying comforting things as his little nemesis fell asleep in his lap all cried out as he stroked his turquise fur as he put him on the couch as he needed to think about this.

He then went to make himself a sandwich.

But he had an idea about the situation that Perry was in as he needed to tell him as he knew that living with him was better than being on the streets.

But he heard the phone ring as he answered it hearing it was Vanessa as his eyes widened as he listened to his daughter.

"I-I'll be there at once." he told her.

He then wrote an note to tell Perry where he was going so he wouldn't freak out.

Tara Doofenschirtz wondered why she was packing her toys and other stuff into boxes as Vanessa hadn't explained bery well to her daughter that she'd be living with her grandfather as she saw the three year old packing but was excited as she loved her grandfather as he was different from other grown- ups and was funny as Vanessa sighed.

Tara had Vanessa's dark hair which was in a pony tail as she was wearing a dress but held something close to her heart.

It was a stuffed platypus that Doof had made for her as she liked hearing about Perry, her grandfather's friend as Vanessa sighed as she and Ferb were musical performers and travelling the world but they knew that was no life for a child like Tara as they had debated over this and Ferb had let her leave her with Doof as they knew he would take care of her.

Vanessa then heard the door bell as she heard her father answer and heard Ferb talking.

Tara got excited as she ran to the living room as Doof smiled as she hugged him.

"Granpa Doofy!

I'm glad you're here.

Jerry's happy you're here too." she said.

Doof laughed knowing she was referring to her platypus friend.

His smile then vanished seeing Vanessa as she knew he was upset as Ferb told Tara to go play in her room until he came for her as the youngster understood as she ran upstairs with Jerry in her arms as she could play for a while.

She was nervous seeing her grandfather sad when her mother came into the room.

"Don't worry Jerry.

I'm sure Daddy will make things better." she said to him.

She then played secret agent.

It was a game she'd made up from her grandfather's stories.

Ferb smiled watching from the door as he would miss seeing Tara grow up.

Tara then heard the door open as she struck a karate pose.

Ferb saw her relax as she saw him enter.

"Come on honey.

You have to go with your grandfather.

Your mother and I will always love you." he said.

He then placed a locket around her neck.

Tara didn't understand as she left with Doof.

Vanessa sighed as she saw them leave.

Perry awoke later but saw that Doof looked worried as he wondered what was going on.

Doof knew he needed to explain about his idea as he listened intently as he heard whimpering from Doof's room as Heinz sighed.

"That's Tara my god daughter.

Vanessa and Ferb wanted me to be her caregiver as they're travelling the world on a concert tour.

She adores the both of us.

Right now she's taking an nap." he said.

Perry had made up his mind about Doof's offer.

"I'll stay Doofy.

We need each other to survive, remember?" he said.

Doof smiled seeing the turquise furred male hug him but then realised Perry wasn't an agent anymore as he'd retired but liked that as they could be friends and nobody would stop them.

Perry then went into Doof's room as he saw Tara asleep with her little arms wrapped around Jerry as he couldn't help but smile.

He knew he'd made the right choice knowing there were two people who needed him.