I admit (with absolute respect) that even I hesitate regarding Twillestia (romantic/physical) pairings. I *think* what causes myself (& others) to feel uncomfortable is their relationship as teacher & student (starting *very* young for Twilight) which deepened into mentor/apprentice (throughout Twilight's entire childhood). That doesn't even cover the 'Princess, Ruler & Savior of ALL Equestria' & 'Goddess' roles Celestia holds.

So to have a romantic/physical relationship with Twilight (who's still fairly young & immature emotionally) can't help but feel like a loved/trusted adult taking advantage of their position(s) of power/authority/influence over a child/teen. If Twilight were an 'adult', I don't see anything wrong with it at all.



(That's just my 2 cents after reading a few comments) ^^ Not at all meant to be argumentative or insulting/shaming in any way. That said, the artwork is beautiful, & expresses a very warm affection between them.