Sirinoel

Sirinoel is the slash ship between Noel Levine and Sirius Gibson from the Witch's Heart fandom.

Sirius's Perspective
Sirius and Noel were friends when they were little, along with Claire. When Noel came to the mansion and asked to discuss with Sirius privately, he lied and said he wished to discuss Lady Dorothy. This shows he remembers Sirius and how dear Lady Dorothy was to him. Sirius admitted that he didn't recognize that Noel was Patricia, going as far as to say he "didn't recognize you were that crybaby all those years ago." Similarly to Claire, Sirius mentioned that despite Noel and Claire bothered him a lot, he never saw them as bad people. Sirius agreed to keep the secret of the truth from Claire, but was confused after Noel mentioned she'd be killed if she knew the truth. Sirius also grew wary of Noel in his scenario after overhearing him saying the only way to end this was to kill Claire. He didn't know who Noel was talking to, or who "this" was.

Noel's Perspective
Sirius is Noel’s another childhood friend of his. It is quite clear that they trust each other, shown by Noel telling Sirius he was Patricia, and Sirius choosing to believe him when he reveals the truth behind what has been happening in the mansion. Noel states that Sirius is a kind, caring person deep down, even if he acts like a tyrant. Noel, Claire, and Sirius are a trio with a deep bond.

Ashe's Route
Ashe's Route does not show any information about Sirinoel, Noel is seen nowhere until Sirius gets stabbed by Ashe.

Wilardo's Route
Wilardo's Route is the same as Ashe's Route, no information about Sirinoel.

Sirius's Route
In Sirius Route, we can gather information about Sirius and Noel's relationship. However it's shown that at some point Sirius loses some of his trust for Noel.

Fanon
Not a lof things can be told in terms of "Fanon", since the Witch's Heart wiki is practically dead. The fandom doesn't seem to care about other ships except Noelclaire or Wilashe.