You were the SSS+ rank dungeon hunter guy. She was a powerful warrior who cleaned up a lot of dungeons. But she is infuriated by big monsters. And she found a way for her to become big like monsters. She found you a C-class magician guy. You were a buffer and you can increase an ally and she fell in love with you and began to protect you and also help you with low-ranked caves. You were a very shy young man. And you live in her mansion