And make sure to reference nerdy clothing all the time - and nerdy large ugly glasses, that hide an adorable and cute round face that the giant tall hot guy just can't help but kiss.
e_e Like. I read these tropes, and there's some stories I actually enjoy that do these tropes. But good god. Some are so obvious. It's a formula now.
But honestly - you said you write fantasy and comedy. Just take a syringe and pulse that kind of humor into your little story. It doesn't matter if it's popular or fits the mold. What matters is if you have fun writing it. And if you're asking because you're unfamiliar with how to write BL - honestly - just take a stroll for a few hours through the BL novels already on Tapas. Hit up the fresh section in the search, and the popular, and then genre by genre. It's annoying to hear, and do, but "researching" by reading other people's stuff to get familiar with something you don't know is better than going at it like "I'll write it like a hetero-normative relationship and just change the girl to a guy and all will be fine". That's an okay approach to take, but I've seen stuff done that way being highly disliked. Heck, even a manga that takes that approach and turns into a joke and then writes an actual story around it without ever addressing it in the face of the readers has angered fans of the BL and yaoi genre who lack the ability to see that it was a joke and has sprung into a real story.
I don't even do research for what's popular or normal or expected of whatever genre I write because whatever I write never fits into the existing expected genres. It's why my stuff is so hard to put into sites that have genres and such - because "it's not quite this, and it's not quite that, but it has elements of this." I could switch my genre from Fantasy to Drama and while my audience might change, the content of the story would not.