IENF-181 - Caught by my little sister, but it's even better? From 'just rubbing' to full-on raw penetration

Featuring Rin Miyazaki, Lara Kudo, and Yui Tenma. The premise for all of them is a younger sister sleeping in her brother's apartment while still in her school uniform. The brother gets aroused by her legs and peach-like bottom peeking out from her skirt and masturbates. The sister wakes up, looks at him with slight disdain, but out of sibling pity, decides to help him finish. It starts with a perfunctory handjob, moving to oral, cowgirl, and finally penetration, with the sister moaning for her brother. However, the actual gameplay felt a bit plain and tame.