The Classmate Girl From My College Days Returns My Kindness in a Bridal Dress

Satou is a working adult stuck in a stagnant career, and his sole encouragement comes from the lewd selfies he receives in his DMs on social media. After finishing his overtime work, he encounters a woman named Miyu Mishima, his former classmate from his college days who — while clad in a wedding dress — has shown up to his place uninvited. Mishima claims to be the one who's been sending him selfies, and that she has come to deliver Satou's happiness. To show him proof for the selfies, she takes off the dress to expose her boobs, letting him confirm that her boobs are in fact, the same ones from the pictures. In doing so, he becomes unable to hold back his excitement and ends up having sex with her... (Source: DLsite)