While my wife was away on a trip, I was bedridden with a cold. My sister-in-law Tsumugi, who always looks at me seductively whenever we meet, came to take care of me, but... I couldn't help but get an erection when she chewed me and licked my sweat! She tempted me with her sweaty black stockings and said, "Shall I make you feel better?", and I was stroked by her beautiful ass and exploded! The act escalated, and I was showered with urine all over my body, and I was rewarded with a face-sitting cunnilingus, which tickled my masochistic side and made Kokoro very excited. I ended up having sex with her over and over again while covered in sweat in the room with my wife away...