It seems that Sou has been Sexually Harassed by Misaki Haizuka. though What really has happened, I will be only sure when translation arrives as my Japanese is rudimentary. I can't read raws correctly.
I am partial to big boobs as well. In fact, Sumire's boobs are well within my strike zone. All she has to do bully my crotch with her breasts and I'll happily support her brand.