My Childhood Friend Is Frustrated By His Desire For Me

Three months after Naoya blurted out a confession to his childhood friend, they've started holding hands, kissing, you know, the usual boyfriend starter pack. But recently, his boyfriend Shuichi has been afflicted by a severe thirst that only Naoya can quench - can he get over his fear long enough to put them out of their suffering? (Source: Futekiya) Note: Includes one extra chapter.