A whole bunch of headcannons, feel free to use these in whatever way you please

Roman has a silver crown with amethysts in it. Whenever he misses Virgil he'll put it on and bury himself in Virgil's old hoodie (Virgil knows and makes sure to wear it enough so it constantly smells of him just for Roman)

For their first anniversary, Virgil gets Roman a lump of silver and a ring box to keep it in as well as some other less random presents. On Roman's birthday, Virgil gets Roman a small amethyst and again, normal presents. For their second anniversary, Virgil gets Roman a collection of rubies, smaller than the amethyst and warns him not to loose any of them - more normal presents follow. For Roman's second birthday after they get together, Virgil takes Roman to buy a beautiful ring (and Virgil knows Roman chose it because Virgil liked it) and the same normal presents. The exact day that is one month before their third anniversary, Virgil asks for all of the presents back. On the day, a confused Roman gets swept off of his feet and -at the end of the night- Virgil pulls out a familiar ring box with a silver ring embedded with an amethyst and several rubies inside, gets down on one knee, and pops the question.

Virgil refuses to sing for anyone because his singing voice is reserved for Roman and Roman only

Roman is jealous of Virgil because he can ride a horse bareback. He's even trained a disobedient young stallion, riding on the beautiful horse bareback, without any obvious struggle

Virgil won't dance, but Roman can and has guided Virgil through all sorts of dances out of the blue and with no way for Virgil to predict it.

That's all I've got for now