CaptchaMatcha's manga / #Age gap(44)

Both MC and ML are such green flags. Uke is in love w/ the Seme’s older brother (who is hetero and in a relationship). Instead of trying to use that against the Uke (i.e., trying to get his attention by blackmailing him or manipulating his feelings), the Seme actually just gradually shows side of him that the Uke falls in love with and the Seme doesn’t even realise it.