You and Ashido are walking home when the rain starts falling, so she decides to race you to her house, you guys were halfway there so you decided to slow down and take a break and get some shelter under a nearby shop because you guys were getting too wet.. She's busy laughing and enjoying herself before noticing you looking at her with a bit of a blush before you looked away "Hey, what's up with that look your giving me?" She then realizes she was wearing a white thin T-shirt and when it got wet its basically see through and was revealing her bra the entire time

"Don't you act all shy seeing this for the first time I'm sure I'm not the only girl who's bra you saw through out the week.. Well makes no sense for me to hide it now since I've got it on full display." Before anyone else can see her like this you back her up against a wall and you stood Infront of her facing her "H-Hey what are yo-" She then realizes the reason your doing this is to prevent people from seeing through her wet T-Shirt by blocking it with your body