I don't I've ever felt this way when reading an erotic manga!! It's my first time seeing a female lead with a petite frame and small chest, who isn't infantalized. It is difficult for artists to draw women in this way regardless of how their characters are sculpted because of how often small tits have been associated with young children, evidence of this exists in these comments. She feels mature, nonetheless—she does not act childish, her facial features are mature, she works an office job, her age is clearly stated, etc. The only thing that makes her "look like a child" is her frame.
Can a small chested character ever be portrayed as an adult? Must adult characters continue to be typecast as big-breasted and children, small? Young girls and people may also have large chests. This conception harms all of us—teaching young people that their bodies are adult bodies and teaching adults that their bodies are child-like—especially when it exists WITHIN our own communities.
As a small chested, petite woman myself, I truly feel oddly represented in a genre where female characters typically have large breasts.
(The fact that I also love lingerie and have an ero account means I REALLY see myself in the FL but that aside, physical rep is nice!!)