Here is how Dusty and Ishani returns goes in Candace and Stacy's time with Sebeena.
As Perry returned home.
Phineas Flynn: There you are, Perry.
Pound Cake: We'll see you later, Phineas. We better go home.
Pumpkin Cake: Yeah, We don't want to keep our parents waiting.
Mrs. Cup Cake: Pound Cake! Pumpkin Cake! Time to come home!
Pumpkin Cake: Coming, Mom!
Ferb Fletcher: Cheers!
Sylvia Marpole: Well, You two did a wonderful job with Sebeena. Now, If we could just wait for Dusty and Ishani coming back.
Sebeena Crophopper: (happy gurgling)
Dusty Crophopper: We're back!
Ishani: How's our little one doing?
Stacy Hirano: She's doing great.
Candace Flynn: He had a fun time babysitting Sebeena.
Dusty Crophopper: That's great to hear.
Ishani: How would you girls like to babysit again anytime?
Candace Flynn: Sure thing.
Stacy Hirano: We love to.
Dusty Crophopper: See ya.
Stacy Hirano: (as she was very warned out)
Candace Flynn: Let me help you.
Stacy Hirano: Thanks.
Candace Flynn: No prob.
With Yuna and the others.
Princess Yuna: That was a great day, guys. What do you think of that explosive Agent P, Mario, Luigi and Sonic and I stopped?
Snowdrop: Sounds dangerous.
Princess Yuna: Yeah. Hey, Where did that come from?
Snowdrop: Where do you think?
Princess Yuna: Hmm?