JUX-356 When I woke up, my wife's sister was sleeping next to me... Yui Oba

The morning sun streamed into my bedroom... One day, I woke up with a hangover and noticed a woman's hand touching my body. Thinking it was my wife, I followed the hand and turned over the covers, only to be greeted by an unbelievable sight. It was my wife's younger sister, Yui, who had come to stay with us the previous day to look for a job, sleeping naked in her bed! "This is bad... This situation is really awkward..." I somehow managed to get out of the situation without my wife noticing, but since then... Yui has been sneaking around my wife's eyes and seducing me, as if toying with me...