it took such a big turn from -"i will look after your injuries Niisan" to "I will do BDSM to real quick" lol Ogawa sensei never fail to make twisted yaois..
Not sure if they are halfbrothers or stepbrothers. Doesn't really have a "good" ending despite being "together", it's rather bittersweet, at max. Though it is somewhat realistic with the Uke still suffering over his feelings and decisions despite having gotten the Seme.