"Do you still want to be younger, Annette?" You turn to face her.
Her eyes widen. "Um...y...yes." She blushes.
"Ok, let's start slow." You get out your phone and dictate some changes to the app. "You're going to get a day younger every second. So that's one month every 30 seconds, two months every minute. One year every six minutes. This process will continue until you say 'all stop', or you're reduce to the age of 2 years old. Your mind will not be affected, you'll remain an adult mentally and emotionally."
She blinks at you, even as her body shivers from the transform beginning. "Why 2 years old, exactly?"
"Well, that way you can still walk and talk, I don't think you want to be a baby again."
"Uh...that would be kind of scary, I guess. And I'm sure neither of you wants to take care of an infant." Several emotions flicker across her features in rapid succession.
"I'd take care of you." Jamie says lazily, as she lays between your breasts. "I mean, I'd have to be bigger, of course."
Annette smiles down at her shrunken lover. "Thank you. I thought you'd be mad at me for earlier."
"Hm? Oh, that. Well it was scary for a moment when you actually put me in your mouth! But...um, it felt really nice, too. Just a little warning next time?" Jamie sits up, putting her back against your right breast.
"Say, um, did I hurt you, Jamie?" You ask, nervously.
"Oh, I'm a little sore and bruised, to be honest. I probably hurt you a little, you're still a virgin down there. Good thing I'm so weak at this size, or I'd have broken your hymen, and that would have been a real mess."
You blink a few times, a little surprised. "Oh, so I'm still a virgin?"
Annette kisses you. "Only technically, I mean, you've had sex with both of us."
"Anyways, let me heal you up." You program the changes into your app. "And clean us up too."
Jamie giggles. "That tickles, but thanks. I was absolutely soaked to the bone. So I was thinking, you know, I love being this tiny, but it'd be easy for me to get hurt. Could you, I don't know, make me invulnerable or something?"
You think about that, and make the request to the app. "I want Jamie to be completely resistant to any injury, disease, or toxin. She will have greatly increased health and stamina. In addition, no matter how she becomes, people can hear her and understand her perfectly when she speaks. Also, her physical strength will remain the same as when she's adult sized."
The female voice chirps from your phone. "Warning: requested changes will alter the subject's physiology to no longer being classified as 'human'. It is advised that only a partial change, within safety parameters be enacted instead until you have read the safety guidelines and understand the risks involved. Do you request the partial transformation?"
You blink. "No longer...uh, yes, do that. In fact, do that for Annette and myself as well."
The app replies. "Clarification required: do you wish to have your physical strength increased to what it was as a male, or do you simply wish to not become weaker than you are now?"
You look to the girls. "Ladies, what do you think?"
Annette shrugs, and you notice her breasts have already shrunk slightly in size. "You can be as strong as a guy, that's fine with me. I guess this means I'll be as strong as I was at 36? Or the strongest I've ever been?" Her voice seems just a bit higher pitched, as the effects of puberty are being undone while you watch.
"Ah, I do wish my strength is increased to what it was when I was male. And set Annette's base strength to the strongest she's ever been in her life."
"Transformation in 3...2...1...Transformation complete."
You feel a shudder as something changes to your body, but visibly, you can't tell the difference.
Jamie flexes her bicep. "Huh, so I wonder how strong I am, then? Oh well, guess we'll find out eventually. I do think I should probably get a bit bigger than this, unless we're going to have more sex. I mean, I don't mind, but I'm getting hungry again, and we have pizza left."
"That's not a bad idea" you say. "Let's make you, hm, how about 2' tall?"
Jamie giggles. "Yes, that's great." She begins to grow in size, and you get up, carrying her easily.