definitely Ulquiorra and Orihime from the anime ‘Bleach’. He’s a villain but one could also consider him a ‘monster’ since he’s artificially made by a bad person for bad purposes. Orihime and Ulquiorra’s relationship reminds me largely of Reylo due to a similar interrogation scene, an emotional hand reaching scene, and overall conversations that resemble Reylo’s dynamic.
At the very end of the series, it is implied in poems and overall subtext that the author wrote that Ulquiorra and Orihime had this type of connection/bond/friendship blooming, and Ulquiorra was in love with her by the end. (It’s sometimes a controversial topic, but that’s what I believe and is fairly obvious if you look into it)
Unfortunately Ulquiorra died while they held their hands out to each other, while Orihime tried to grasp his hand, it faded into the dust. In an extra drawing the author did, that moment signified they wanted to reach each other but were destined not to. It’s a tragic story and again, has a lot of subtext, but totally and utterly Reylo.
Here’s some videos of them:
https://youtu.be/5zyWG9AU8Ko?t=59
https://youtu.be/t71S6VJibsk?t=3
https://youtu.be/XgCzOP-QhDE?t=175 (the only actual clip i could find without music over it lol)
Submission by @daily-reylo Thank you!