It wasn't something new to him. Even without you telling him he knew you age regressed. It was obvious, not in a bad way though. He liked taking care of you when you were regressed. He found it cute, and it gave him a nice warm fuzzy feeling in his chest.

He had just gotten home from work, entering the shared apartment the two of you had. He saw you curled up on the couch with a blanket. Something you would never do if you were 'big'. A dead giveaway that you were regressed. He couldn't help but smile, he gets to take care of you again. He comes around the couch, kneeling down beside you. Gently pulling down the blankets to reveal your eyes. They were wide, unusual since your eyes were usually narrow, another dead giveaway. "Hey hon... you small?"