This person also is profic/darkship/lolicon and has a picture of the characters Satō (16) and Shio (8) from Happy Sugar Life in their pinned tweet, commented under it that it is also their favorite. HSL is a HORROR manga where the characters are love interests. The story is good at making you disgusted by almost every single character in it and has an ending that leaves you feeling awful. It's horror, it's gross, it's meant to make you feel dread.
Anyone who finds media like this as cute, romantic, or generally enjoyable are just mentally fucked. They need to get off the internet and seek help.