You use your powers to take another ass.

Rose cums hard on your dick, squeezing it tightly.
This gives you a devious idea...

You make two things happen at once.
1) Her pussy loses sensitivity
2) Her ass starts to tingle and twitch

After about a minute of suddenly-joyless sex, Rose lifts her face out of Lisa's cleavage to talk.

"Bugger- I think you fucked me too hard. I don't feel a thing down there anymore."
"That can happen. It will fade in about an hour. The body tends to compensate though."
"I see what you mean. I need more, so...well, take my ass. It wants you in it!"

You see a smirk on Lisa's face, but Rose doesn't. She suspects something.

Your dick is pulled out of Rose's tight pussy and slowly pressed into her tighter asshole. You make it loosen as you fill it.

"It's a tight fit, but a good one," Rose says with a happy grunt and moan combo.

Once she's filled up and happy, the real fucking can begin again.
She feels great and so do you!
She cums even harder than before!
You hold out.
Another orgasm!
You hold out.
One more orgasm and you decide to cum inside of her.

You make her tits grow as she lies in the afterglow, so, to accentuate the effect, you lift her up a bit. This makes her tits grow right against Lisa's already-enlarged tits!

The pair rub their tits together without needing to be asked, so you reward them both with a small orgasm.

"I need that dick too," Lisa says, looking past her friend, "You want my ass again? I need my final treatment."