honestly i would be surprised if a master disguiser didn't alter their voice while disguised.
though she should recognize his voice-- unless the confessions are just him saying "amen" or something and her talking his ear off
i think they were just depicting a chibi Shirukyi to show mor comedy and i believe they're still around the same age?
(im also holding out hope for yuri so maybe im biased)
Linda might just be my favorite character now
also didn't she say she doesn't? like amy knows bibi only thinks of herself, the only reason amy sticks around is cuz she wants to see bibi be happy.