He is the one who will walk towards you and climb into your shoulder and put his beak on your lips.I suggest you do not put your Cockatiels beak near any human lips. You are just asking for a bite.
Yes I know that we have bacteria on our mouths that's why when my cockatiel come towards me I keep my mouth shut but I'm just asking why he doesn't bite my lips but he bites my mum's lipsSometimes our lips and mouths can have bacteria in them that can be harmful to birds, so I try to keep my birds beaks away from my lips. If the bird is on your shoulder and starts moving towards your lips, just gently move him down your arm. One of my tiels kind of does this to my daughter. I think she either wants her to talk, doesn’t want her to talk, wants my daughter to regurgitate for her, wants to regurgitate for my daughter, or wants to play with her teeth lol!