It's no surprise that both ROWAN and CAL give you all the feels when you read about them. (You know, the swooning, the squealing, the jumping up and down, the freaking out because you can't even? Yeah, that's what I'm referring to.)
It's also no surprise that boys which magical powers/abilities*/faeness** are perfect and there is no way you can keep yourself from the looks you get when you read about them in public.
Sorry, I can't help you with that, but what I can do is explain to you why you get the feels when you read about them (with examples).
1) Your fangirl/fanboy senses are detecting hotness and it doesn't know what to do except make you feel the feels. This one is probably the most common reason among us fangirls and fanboys and also explains why you were texting your book bestie in ALL CAPS about how you were freaking out because CAL was shirtless and ROWAN is also a hawk.
2) The scene is getting very steamy, making you blush and squeal. For some reason, this happens to even the best of us in public. It also attracts a lot of attention and looks from the non-readers. (They just don't understand.) For example, when CAL was teaching Mare to dance and when ROWAN came to protect Celaena after she left Mistward and went into the woods.
3) Sometimes you get the feels for no reason whatsoever. This is like when you suddenly remember your book boyfriends in the middle of a store or random place for no reason and can't control yourself.
I hope this helps you make sense of why you get THE FEELS whenever anything CAL or ROWAN related happens in your life.
*if you want to get specific for CAL
**for ROWAN (even though that's not technically a word)