I never thought that my girlfriend's quiet and quiet sister Yuhi would be so erotic... It all started when I was helping her study, and I sneakily touched her body. She suddenly started to devour my dick, and I thought, "Oh, she's nearby!" I ejaculated with pleasure, even though I was tormented by a sense of guilt! After that, I gave her a footjob while she was sleeping, carefully licked her ears and balls, and even licked her anus, which she had never licked before, with my fast tongue... I felt sorry for her... I got so crazy that I even forgot about those feelings. Even after ejaculating, she had an inexhaustible sexual desire like a succubus and inserted my dick! She was making a lot of love juice and making lewd noises, and I came inside her while she was sleeping in a cowgirl position! I thought she was a kind and innocent girl... but she was a psycho sex killer who loved thrills and pleasure in sheep's clothing... Before I knew it, I was captivated by Yuhi.