Just like candy - Sirius Black x Reader *smut*

Requested by @underworldsheiress : Hi, can I request a story where the reader is Remus twin sister and she is in love with Sirius since the first year but is too shy to tall to him because she is his opposite. But Sirius is in love with her and won't admit because she is the little sister of his best friends. And the reader and Sirius are doing a project together and somehow this ends up in smut and Remus finding them having sex and gets angry. (Sorry if is too detailed and maybe I had sent this incomplete by accident before.)
Warnings:THIS CONTAINS SMUT! My English as always and swearing(?) Lupin Sister?
Gifs aren't mine. Credits to their original owners.