Hm? A fellow Cheating Bitch Holly connoisseur? I commend you for your taste.
If by slutty Holly you mean Holly not in a relationship with Ian and goes fucking around, then yes there are hints of them potentially getting together. If you don't choose the romantic option when Emma talks to Ian, then Holly will later visit Ian in his room for sex. You should also have Ian compliment Holly earlier in the beach. I can see them becoming together while Holly still retaining her sluttiness.
But I would argue there is a better path. A sweeter and more bitter path. You can have Ian and Holly be in a relationship from the start when they went on a trip together. You will then have a Lena that fucks everyone and flirts with Holly. During the beach episode, Holly will confess of kissing Lena and having attraction to her. As Ian, you will choose to be more understanding of the situation and have a talk with Lena. This will end in a wholesome threesome, and a potential for them to be a throuple. But here's the catch. Lena is still the biggest slut in that throuple and I believe in the prophecy that she can seduce Holly into becoming a cheating whore too. Lena and Holly will cuck the living shit out of Ian and we will get to watch a pure, innocent girl spiral into becoming a cumdumpster. After learning that Ian's ex girlfriend Gillian cheated on him, Holly once remarked at the absurdity that such a thing could occur. She could never imagine how a woman could ever cheat on such an amazing man like Ian. It would be a catharsis to see Holly doing exactly the same thing to Ian as the woman she once resented for being a cheater. Lena convincing Holly to fuck Axel or Marcel behind Ian's back is going to be so delicious. I can't wait for CBH path.
