I returned to my hometown after many years of studying and working in Tokyo. My sister was still the same, still a hikikomori, all day in the game room. She wore a loose shirt, no underwear, so her breasts kept hiding in front of my eyes. When my mother went shopping, I accidentally found her masturbating in the room! Unable to resist her seduction, I went in and stuffed my cock into her pussy! She didn't seem to have any intention of dodging, even coordinating with me! And after that time, she took the initiative to find me, and secretly had sex with me during her stay here...