The ex-fiancé opening his eyes to the world of Yaoi will alway be one of the funniest developments of this series.
Btw, hell yeah the mom should accept that Makino is also dating a woman, otherwise her whole "support" towards the sister was because she had a backup (aka the younger) and not because she accepts her children being gay. And if the dark speech bubble indicates anything, bigoted twats don't become good and accepting people out of the blue.
Tho Mashiro's worries are valid because of her line of work. I doubt that Makino's conservative parents would be ok with her second job, that now after getting fired as "Sato-san" happens to be her main source of income
Let us see...