Stylesheet

body.loggedin.post-linkflair-m001.comments-page:not(.comment-permalink-page)>.side .flairselectbtn.access-required::before{content:"I love you, " attr(data-name) "."}

Inspect doesn't work because it's using ::before on your username in the sidebar.
It also only adds to the post based on the post flair (looks like there's a mod-only heart-shaped flair on the post).