Use your powers to accompany them by being one of them.

Chapter by Aurora

"Oh my dear daughters... I have an idea that I believe will solve this problem outright, while still allowing us to head out together as a family~!" You speak up, smiling as they both look at you. You look over both of them, not making it clear that you were sizing them up for what you had planned. "Y-Yes Mother? What did you have in mind?" Dialga asks, her head tilting to the side, wondering how she would possibly head out with them and not cause a panic, while managing to shop with them.

"Well... Depending on how comfortable with it you two are... I do have the ability to 'hitch a ride', so to speak." You phrase it in a way that feels right, but the only thing this does for Dialga and Palkia is confuse them more. "H-...Hitch a 'ride', Mother? What do you mean?" Palkia asks, turning to face you, as you stare at the two Pokémon in front of you, eyeing up their assets. "Well... I'll just be forward with it this time... If you would allow me, one of you, I can allow my form to enter your body and take control of it. Better yet, this would alter your vessel to be more akin to my own, thus making it easier to find clothing that would fit me." You explain. As you do, their faces begin to grow warm as they blush their hearts out. "It would only have to be one of you, but... this way, we can still go out, and not worry. Is that alright with one of you?" You ask cautiously.

They both look at each other, wondering who between them would step forward. The idea of offering their own body for their mother to inhabit was... oddly satisfying? They didn't understand these feelings, but they didn't have the time to do so. "If it makes you both feel better, you all can still control our shared body as well. After all, you both know your way around the city much better than I do!" You reassure them.

Before you can continue, sweating a bit as you wonder why they weren't speaking, Palkia steps forward. "If this is w-what you desire, Mother, then... I... suppose you could use m-me as your vessel?" She says shyly, while her face glows red from the heat in her cheeks. You smile. You weren't opposed to this in the least. After all, it was Dialga you originally entered, but you never actually spent any time inside Palkia. Perhaps this could be a fun experience for the both of you! "Well, if you are certain, my daughter, I would gladly accept your offer." You say, as you give her another hug.

Once you pull away again, you begin to focus. You imagine yourself turning into a ball of light, and as you do, your body indeed begins morphing. You feel your arms, legs, and head all disappear, fading into non-existence. Before long, you find yourself floating in the air, as a ball of floating light, just as you wanted. You find Palkia's energy, and float towards her. She is extremely nervous, watching her Mother suddenly turn into a floating ball, and floating towards her, but she does her best to steady herself, in preparation for... whatever it was you were going to do.

As you get closer to her, you see her standing straight and stiff. You chuckle internally, and before long, you begin pushing yourself against her, and as you do, your body begins entering hers. Your light begins enveloping the Space Goddess, and you feel yourself entering her. She begins letting out a few light moans here and there as she feels your warming light enter her form.

As you get yourself nestled inside her, you can feel her body changing as more of you manages to squeeze inside. Her breasts slowly grow bigger, and fill with milk, while her butt gets a large expansion, only offset by the fact that her entire body grows in size to match your own. By the time all of you is inside her, her body has completely shifted to look more like a minor fusion of the two of you. It's still mostly Palkia's body, but there are now golden rings that circle the pearls on her shoulders, as well as a small few shades of the gray from various parts of you that now fill in a few gaps. Her head now also sports a flowing mane of white, like yours, however, hers is shorter, and flows forward, rather than backward.

As everything finally settles, you open your eyes, feeling... different. This was expected of course, but in what way, you weren't sure. You see Dialga, now standing in front of you, a mix of curiosity and worry on her face. You bring a hand up, and see Palkia's claws. You smile at your 'sister'.

"Hello Dialga. I believe this has solved our issue. Shall we go shopping now~?" You ask, your voice mostly consisting of Palkia's tone. Dialga looks at you and blushes, before responding. "Y...Yes... I s-suppose that does resolve things..." She says nervously, but also seemingly slightly enjoying the sight of her sister, now possessed by her own Mother...

"Wonderful! Allow me to bring forth your sister, and we can go~!" You say cheerily, as you close your eyes, allowing yourself to fall into Palkia's subconscious, while she regains control of the fused form her body has taken on.

"Aaah!-" She shouts for a moment, surprised to suddenly wake up, and feel... different. Bigger... She looks down, noticing that her breasts were straining the top she had put on this morning. Her rump, too, was having a hard time being held in by her pants. "Ooohhh... M-Mother... This feels... so good..." She says, carefully exploring her body. You simply watch from inside, giggling as your daughter explores herself as if it were her first time. ["Yes my dear, we are quite beautiful together, aren't we~?"] You say from within her mind. She is surprised at first to hear your voice in her head, but quickly comes to understand how easily that might come to you, so she calms herself.

["Now then, let us go shopping as a family!"] You happily shout to Palkia, who nods, motioning for her sister to follow. Dialga quickly gathers herself, and trails behind the fused goddess. It was time to shop for their Mother!

Suggestions:

•The trip there is mostly uneventful, and the shopping trip begins!

•Some Pokémon stop you to ask questions!

•Something else...?