One cold winter day... I was lucky enough to win a "Kotatsu" in a lottery! I put it in my room right away, and my sisters, who usually don't come near my room, were drawn to the magic of the "Kotatsu" and started to hang out in my room. While watching my sisters' defenseless lower halves in the "Kotatsu", I couldn't help but get an erection... I secretly inserted my dick into my sisters' pussies, which were illuminated by the infrared rays! I got every single one of their warm, flushed pussies!