Mistakes were made

As the door closed behind you, Serena's gaze lingered on Amber's transformed body, her eyes widening at the sight of the cowbell collar and the swollen udders. Amber, still cradling her breasts, looked like she was on the verge of tears. You found yourself almost as horrified; this was all meant to be a fun little experiment, not a punishment, and now she was totally stuck this way!

You looked her over and glanced down at your notes, thinking about all the ways you'd changed her so far, and could now never undo.

-Can't feel embarrassed while you're all hanging out together.
-Can't harm any of you on purpose. (Note: Seems to include socially or emotionally, though that's less clear)
-Must answer all of your questions completely and honestly.
-Serena and her have been fuckbuddies all semester long (Note: Changed the actual past!)
-She used to have nipple piercings she took out when she started lactating and her udders grew to G cups. (Note: Another new past)
-Her milk is a great udder-fucking lube, and she moos when she gets horny.
-Her udders get more sensitive and fill up with milk when she feels outraged.
-Her clothes always show off her udders.
-She has a permanent cowbell collar.
-Her udders get full of milk to the point of pain at least three times a day, and she can't ever milk herself.
-No one can think of her udders with any terms except 'udders'.
-She is highly suggestible to anyone who is milking her.

You thought quickly, trying to think of a way to salvage the situation.

"Okay, let's... um, let's try to make the best of this," you said, attempting to sound calm.

You took a deep breath, trying to think of a way to make Amber feel better about her new... condition. You couldn't walk it back, and apologizing wasn't going to help, so all you could do was roll with it. Your eyes met Serena's, and you could see how she was also eager to help, obviously distressed about what had happened. She was clearly eager to get involved, and you could only think of one way to keep things from getting worse.

"Serena, let's see if we can help Amber get used to her new body," you said, trying to sound calm. "Why don't you start by milking her? Maybe that'll help her feel more... comfortable."

Serena gave you a wary glance, but didn't hesitate long, pulling Amber down to sit on the bed. She reached out, gently cupping Amber's swollen udders in her hands. Amber moved to push her away, but you asked, "Would you rather let her milk you whenever she wants, or let me instead?"

She glared at you, but sighed and took her hands away, allowing Serena to caress her udders. Serena carefully pulled down Amber's flimsy cow-print top, revealing her udders in all their glory. There was already drops of milk forming at her nipples as her anger kept them filling up, and Serena's hands moved up to start a gentle kneading.

Amber groaned deep in her throat, her eyes closing in pleasure and relief as Serena started to coax milk out of her udders. You noticed the way they were starting to make a mess again, and you thought of the first real way you could help Amber's new life suck a little less. "Amber, would you rather your milk disappears perfectly into fabric without ever getting it wet, or that people can drink an infinite amount of your milk without getting full?"

Amber, distracted by Serena's attention, hesitated for a moment, and you saw Serena lean over and whisper something into her ear. Amber's eyes got a little glassy, and she murmured, "I like it when people suck from my udders."

Serena immediately slipped down, latching her mouth onto Amber's right nipple, and Amber let out a happy-sounding moo as Serena started to suckle. Even though you were still struggling a little with the guilt of it all, you couldn't help but be amused with Serena stepping up to take advantage of Amber's suggestibility to make the situation hotter for herself.

The girls slowly toppled over onto the bed, and Amber's hands floated up to Serena's head, stroking her hair. Serena transferred her mouth over to Amber's other udder, using her hands to massage and tweak both of them as she did. However else Amber might feel about all this, she couldn't stop Serena from milking her, and the supernatural sensitivity of her udders was more pleasure than she could ignore.

You found yourself struggling a bit - you were still focused on finding ways to help Amber cope with her changes, but the scene was damn distracting, and you were very tempted to tweak things up a notch instead.