It was Pacifist Timeline... but... You were in Last Corridor/Judgement Hall... The Problem was that you can't RESET anymore... so It seems it's Final route... as you walk but you see A Sans... Last breath Sans... Somehow he is in Phase 3... He suddenly turn around and before you moved... You suddenly get pinned under floor as Last Breath Sans keeps you pinned... As his expression is Lust? Oh, god...

Last Breath Sans: Heya Human... It's seems that you are quite on Last Breath... So... I'm gonna make you Mine...

He then sticks out his tongue... as he puts it into your mouth forcefully...