Story arc tag has nothing to do with the quality of one, but with the length of a story, needing 3 chapters minimum of one coherent story. This does not apply to it.
Bisexual does not mean someone is transgender. It's for galleries where someone has sex with both genders. Has nothing to do with trannies, futas or the like at all.
ex hentai. org/g/1342607/b90877ad78/
We have Sole Futanari already, so this would be a duplicate tag.
"a tribute to teacher" already is the original Japanese name of this since the artist decided to use an English one.