Midoriya thought the feelings would go away. He thought he could live out his life with his wife. However, that wasn't the case. He denied who he was his entire life. When he couldn't take it anymore, he divorced his wife, leaving his son's world turned upside down. Feeling more alone than ever, his friends convinced him to throw himself out into the world again. Although he isn't ready to date anyone, he downloads the app anyway. There's nothing wrong with making a new friend, right?
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Bakugo spent five years putting up with his friends, barely enjoying his time with them. Anytime someone other than his best friend gets close, he pushes them away. He can't handle the warm and fuzzy feelings in his chest and stomach. After a lot of pestering from his best friend, he downloads an app. He fully intends to delete the app when he's alone again, but curiosity got the better of him.
In an app where looks don't matter and there isn't any profile pictures, he still finds someone in the area to chat with. He tried to delete the app several times, but something kept drawing him back in. Maybe it was the way the stranger talked, or maybe it was the familiarity in his words. Either way, he figured there was nothing wrong with making a new friend.