[Tonari] I Can't Tell Him The Truth (COMIC Penguin Club 2023-06) {Mistvern}

Nozomi, an antisocial shut-in who's finally meeting her online crush in person, is a nervous wreck—because the sweet college student Akihiro has no idea she's been lying about her age the whole time. What begins as an awkward first date in a karaoke box melts into kisses, an eager first blowjob, and a breathless defloration where the inexperienced girl climbs on top to take the lead. When he asks to keep meeting up, her heart soars even as her secret burns on her tongue, and she resolves to spill the truth only once she's become a proper adult.