The Biggest Teacher 2 is a slim, 24-page gay dojinshi (a parody genre of manga) with such a siimple story it’s almost crazy.
Set in a school in Shinjuku, three giggling students happen to witness the big gatchi-mutchi (chubby macho) teacher masturbating, he catches them red-handed, and punishes them. They all go for a traditional communal bath later, and the kids get to see - and maybe touch? - the object of their curiosity up close.
Cutesy, fun, with color drawings. Second childhood stuff.
“All produce and drowing by Kondo Musashi” [sic]
24 pages, paperback, B&W and color