the two best anime here if you specifically want gay shit are revolutionary girl utena (must watch if you haven't, cannot emphasize enough how opposed to heteronormativity and patriarchy it is) and liz and the blue bird. showa genroku and turn a gundam are also great but the gay is less central

otherside picnic and bloom into you are both great if you read them, the anime aren't as good (on account of being unfinished). the otherside picnic novels are incredible, and the bloom into you manga is even better