The girl's older sister I was introduced to for the first time is a NEET, a total shut-in! I thought she was shy, but once she got into the kotatsu, she took bold action! While her girlfriend was right there, she reached out and started teasing my cock! She secretly inserted herself while hiding in the kotatsu, pretending to be calm while pushing her bare pussy against me and tempting me with a creampie! It seems like she'd been building up her sexual desire, because she secretly went for a second round without her girlfriend knowing!