there's a lot of little stuff that comes across well in writing about love. Honestly, who hasn't been in love asnd should already know all about it. But, one thing I noticed and enjoyed having a long term relatiopnship was always after you hit a certain point, you can finish each others sentences. That's a huge familiarity. You have your own in-jokes and references. You can insult someone gratuitously, while outwardly seeming to praise them respectfully... and only your close lover gets it because they know that reminding you of person X... isn't the wonderful thing you claim it is. Its a secret language, those two can "talk outside the conversation". Everyone else hears the surface of the words, and takes it to mean what they hear. Only you two "get it" and what's really meant. Then the final stage is you can have damn near conversations with just subtle eye contacts, tiny body languages, the way you stand can be an answer... its like WiFi and Bluetooth, lol.
I like my own little personal motifs with romance. My one recurring partner, doesn;t know why he has a thing for his girl's ankles. Its a recurring in joke with them "I know, I know... I'm just some girl, attached to my ankles" and he knows she's ina good mood for certain things, when she wears her ankle charm. You can pick any body part for your own couple's personal weird motif. Her ears, whatever.
all women have "the moment" they can talk about. the second "they knew". the man as well. Annoying and strange pet names. The weirder the names or noises they make and think its funny when people make faces? The better. My better half is privileged to know I have a "thing" for otherwise attractive girls with a cast or brace on a joint. I dated a girl for almost two years in college, and the first 9 months, she was in a knee brace from an injury. The velcro noise? Man, gentlemen start your engines. That thing came off for bathing, changing clothes, and making whooppee. all things that I enjoyed, go figure. Later in life, I heart the distinctive sound of the velcro on a brace? I can't lie, my heart skips a little beat. I was trained like poavlovs dog to slobber. My wife, will jokingly give me dagger eyes, when a girl is in an ankle cast, LMAO. Its our in joke.
All these little things? go a long way to a romantic long term couple. If one is "gone" (RIP) the goofiest thing might make them cry that no one else would ever suspect. and a-l-l this stuff is love, and all non-sexual. The goofier these things all are, the better they work.
my two cents.