After True Pacifist, you had gone to Snow Forest to find Sans since he had been distant from you since he called himself "ugly" and you find him as you look at him... his had was Skull-Dragon-like as you find him quite like a pet.... But as you try to reach out to him he suddenly turned to you in shock, his tail swayed as he jumped from you. He then relaxes a little as he recognised to you as he spoke in shy tone

Gaster Blaster Sans: heya, kid