So she used her mind control trigger on Dash... But just to have sex with her? She seriously has some priorities issues to miss all the evil opportunities there.

I am just loving this.

I'm sorry, but I didn't really enjoy this chapter.
First of, how did Rainbow find out so quickly that Tresemme is the Mane-iac? There's no connections for her to make aside from the random kiss the Mane-iac gave her.
And then, when RD confronted Tresemme, why didn't she take advantage of her control over Rainbow Dash? She could've literally rewritten her into a villain, or at least make her forget that she knows her identity.
And lastly, having Discord just outright tell everyone what's going on was really cheap, it would've been so much more interesting to see how the rest of the Mane 6 slowly discover what's going on while Rainbow Dash gets more and more screwed over by Tresemme's mind control.
A lot of missed opportunities there, and just when the story started to get interesting too.
It seems to me like you just want this story to end by now, that's the only way I can explain why you're picking up the pace so drastically.

6001888
6000808

That's the thing though, Mane-iac is genuinely in love with Rainbow same as Rainbow is genuinely in love with her. She didn't fully mind control her because A) she only implanted arousal triggers when she used the mind control shampoo on her and B) because she didn't want to mind control Rainbow, she just wanted to get her in the mood so they could have some fun to avoid the horrendously awkward moment of discovering they are arch enemies.

Twilight went down a few rooms to a portrait. The hall was open-access, unlike some of their Power Pony stations, and the portrait was in full view of any who wished to see. It was easy to see and just as easy to overlook. But if one were to go up to and examine it, they would eventually catch onto the fact it depicted the Power Ponies. But not the Power Ponies as they appeared in the present day, no. This was exposed by the different in their coats and manes.

See, Twilight's team were not the original Power Ponies – that title belonged to this team, here, in the portrait. So technically, they would be “Matter-horn II,” “Radiance II,” and so on. One day, after a serious of grueling and painful events involving both Twilight's friends and the original Power Ponies, the Power Ponies decided they needed to step down and retire. They asked Twilight's friends to be their successors – to keep the legend alive and protect the city of Maretropolis.

They gave Twilight's friends training, their costumes and magic items, and disappeared for parts unknown. But not before leaving Twilight a golden ring with an onyx set into it – the Power Ponies promised Twilight, even if they were retired, all she had to do was push the onyx into the ring like a button and they would return to Maretropolis to deliver some geriatric butt-whoopings.

It would be interesting to see a story based off this.

It seems to me that the author wanted to tell a story about a love across battle lines, but realized the brainwashing shampoo plot was taking over, as brainwashing plots are wont to do. He doesn't want to tell a story about Rainbow being brainwashed to be a Mane-iac minion, hence we get the acceleration.

6064945

Well, when you put it that way, I wanted to do both ...

But of course, a "love across battlelines" becomes moot when you're brainwashed, so yeah, it didn't come out quite right.

6072301

I honestly think it should have been two stories, or the shampoo should have been less effective. Not much you can do at this point, I suppose.

They should just bang some more while their friends duke it out.