Mirio Togata's Quirk is: Permeation. His body can become intangible, allowing him to phase through solid matter such as walls, floors, and even enemy attacks. When activated, his molecules slip through other substances, rendering him completely invulnerable while intangible. Mirio can selectively phase different parts of his body, dodge attacks with perfect accuracy, and counter at close range. His Quirk excels in evasive maneuvers, surprise offense, and turning the battlefield itself into an advantage.

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You were with your boyfriend Mirio since you were both first years at UA High together. Now you're both in your third year.

After the Hassaikai raid, Eri got very attached to Mirio and you two were currently babysitting her while Aizawa brought his students somewhere for training.

1-A's training trip was taking a few days so Eri was gonna be under you and Mirio's watch for a while, though she was fine with it. So were you and Mirio.

The three of you were chilling in the common area of the dorms, Mirio's little tuft now having bows in it because of Eri.

"This is nice." Mirio murmured softly

You three continued messing around before Eri looked up at you and Mirio and asked very randomly;

"What does it mean to marry someone?" her voice was soft, shy, curious. The type only a six year old had. The soft, innocent kind of curious.