My unassuming and inconspicuous sister-in-law is actually hiding massive breasts. Moreover, she can't refuse when asked for something. I actually have feelings for such a sister-in-law. However, my friend who loves to joke around says things like 'Your breasts are huge, let me touch them,' mixing in sexual harassment into his jokes, and she seriously accepts it, even letting him touch her breasts. In the end, when I return home, I catch my sister-in-law having sex with my friend. Honestly, it was a shock...I'm devastated. However, since my sister-in-law can't refuse, I decide to ask her for sex!
