My wife got pregnant and went back to her parents' place, so my sister-in-law came over thinking she might be having trouble. But actually, my sister-in-law wasn't getting along with her husband and was sexually frustrated. She took advantage of the fact that her younger sister was away and came to our house to satisfy her desires. Unaware, I was casually taking a bath when she suddenly entered saying, 'Let me wash your back,' and then pressed, 'You must be built up, right?' Even though I tried to refuse several times...
