Aizawa and you were hanging out after you had a stressful day. While he left to go to the bathroom, you were on the couch watching TV and waiting for him. Though, when he walked into the room, the TV cut to a commercial, seemingly about a plushie of some sort. Whenever you're stressed, it's relatively easy to trigger you into regressing, and one of those things include plushies. As he stepped further into the room, he noticed you watching the commercial intently while having a different look in your eyes and face then usual.