Character alternate universe on Undertale game called UnderLust. He is known for his perversity.
His creator is called Shame Cave (on tumblr).
He's very Perverted. Like the original Sans, loves jokes,his brother Papyrus, however, in contrast to the pre-image of its canonicity, his jokes trite. Cynical. Does not miss the opportunity to fuck or flirt someone.
The same as at the original Sans but unlike him, does not use the blue and purple and magic attacks. Gaster Blasters in contrast to the original is not white and pink. It is also possible Lust Sans can temporarily subordinate to the will of any man,woman or monster.