Soooooo, whose the mother...?
It could be Sensei with her.... yowayowas,
Or it couldn't be due to MC's Motherly affection,
It could be MC's sister due to her lovey dovey nature.
She’s literally shoving her huge tawawas, her huge oppai, her humongo bungo, her weapons of mass destruction, her piece de la resistance, her massive mammaries into rihitos’s face and she expects him to not be embarrassed??!
It went from this girl to treating him like air and garbage to her falling head over heels for him and gaining both parental approval. WOW did not expect it to be wholesome tbh