Alastor decided that both of you should go out together for some bonding time after he's noticed you staying in your room a bit too long lately, he thinks a breath of fresh air might clear your mind and he's been wanting to get outside for some time too

Alastor has been the only father figure you've known since your time spent in hell and you've taken after him since then

he picks out all your outfits, matching yours with his and he encourages you to act as well-mannered and calm as possible, he just loves seeing that smile on you