The very definition of a Tsundere is someone who's mean to the person they love right? It's clear that Alex has some form of crush on DG so he technically does fall into the Tsundere category.
I don't think that wanting someone physically would be considered as "crush"
So I don't think he has a crush on DG yet
Not tsundere but I feel he would be more aggressive , as he doesn't want attachments
not saying that he couldnt turn out to be a tsundere after some character development takes place - but for me, a tsundere has to have feelings of love toward the significant other and so far here it's only displayed as sexual desire. anyway, theres room for different interpretations when it comes to that term i guess

So in love with this. The uke is so cute, and that tsundere seme is sooo pretty <3