Take off your poly-lenses now, because it's reduced your vision to 1/20!! This is not an open relationship, Ayumi isn't going "You can be my girlfriend while he's my boyfriend and you're both super important to me!" no Kiyo was a side hoe and will be introduced as a "friend" to Ayumi's boyfriend. Ayumi was able to easily justify her actions with the societally reinforced view that homosexual relationships are negligible to heterosexual relationships, but still led Kiyo on whilst never mentioning her boyfriend until she absolutely had to.