I don't know a lot of loli manga or what even counts as it - does all the Korean manwha about being a litol girl count, per example? Do you mean stuff like Fly Me To The Moon where it focuses on a relationship with a l0li?

In any case, if you want some recs on that front, I recommend Kaori Yuki's manga, a mangaka famous for her beyond amazing gothic artwork and whose work keeps coming back to bizarre themes of ρεdορhilia (sometimes acknowledged as such, sometimes not) due to what is (IMO) some unfulfilled childhood fantasy or another lol. Her manga Angel Sanctuary (my second fav of all time) has the young Kurai get seduced by the vaguely FtM Belial, a princely jester demon, and it goes real hard. In a shocking scene considering the audience for the manga was young girls, Kurai gets threatened with some Cannibal Corpse-esque fate by a vkei-looking androgyne. But that "Kurai in Hell" is the only arc in it to feature it prominently.

Much more prominent it is in Grand Guignol Saga which is about a lοlι dressed up as a boy with whom the main character, a young man (in truth a genderless castrati-coded androgyne who has not turned into a man yet - it's complicated but very relevant for the relationship, and also you may notice a recurring theme here lmao) who looks halfway between a vkei band member in gothic attire and one of those tall princely-type gacha males, Lucille, is in love with. Unlike in AS where Belial is unambiguously predatory if sexy and genuine in their affections, here Lucille's attraction towards the girl, Celestite, which is at least by implication sexual (another character arc's tells us that these androgynes turn male or female largely based on their own feelings, specially on what "role" they want to take with their partners - Lucille's past partner wanted to fuck him, so he develops into a man to be able to penetrate them when in the hope's they'd develop as a woman, but Lucille too wants to develop male, which he hopes his attraction to Celestite will be able to carry out that development, which is insane but treated as if it's normal).

In this manga Kaori Yuki truly gets taken over by her Shadow and just ignores all the outstandingly dubious implications bc she's fulfilling her little childhood lοlι/androgyne prince fantasy. In any case, it is outstandingly shoujo aesthetically, up there with the best as usual for Kaori Yuki, and is among the best manga (at least in the shoujo field) in the "straight pεdεrαsty" genre, where there is a sort of boy/youth mix of homosexual equality and age-graded interactions tied with pedagogy etc, but the boy is actually a crossdressing girl who later marries the youth in question.

Another good manga in that genre, also a shoujo (most josei manga with such contents belong to what I like to call the "female wife-husbandry" genre where a young adult woman raises a boy that she later marries lol), is Kaze Hikaru, about a crossdressing girl raised as a samurai boy. I don't think this one truly counts as a lοlι manga lowkey, it lacks in lοlιconisms, but it is among the most well known stories of the genre.

Some other ones off the top of my mind: Meiji Hiiro Kitan (not fully translated lol) and Dazzle (enormously long classic-style josei by the Maria Holic author of all people). Can't vouch for these quality-wise, it's been ages, tho I like Dazzle's style certainly.