SIS-121 - Even though she was such an older sister's child... ~ Sister raped by her younger brother on her last hot spring trip as a bachelor ~ Ayame, 36 years old Ayame Ichinose

Ayame Ichinose has such a cute face that you'd call her a beautiful girl rather than a mature woman, but her voluptuous body is undeniably mature, which is a great contrast. The thick pubic hair adds to that erotic gap. Given their ages, the taboo relationship between siblings feels more realistic than a mother-son dynamic. Since it's set at a hot spring inn, seeing her in a yukata is a nice bonus. It starts with her being 'ravished' by her younger brother, but it's interesting how she becomes the more proactive one later on. I really like this series.